Ultimate Performance Rear Shock Mount Kit
This product was last offered at the strikethrough price on
06-13-2026
Product Details
BMW has long suffered issues with rear shock mount blowout on M3 and non-M 3 Series models dating back to 1984 with the E30 chassis. Little changed over the following two decades, and E36, E46, and Z3/Z4 models are also prone to this style of failure. After striking a pothole or another seemingly innocuous obstacle, a clunking from the rear emerges and handling becomes sloppy. Your shocks have blown through their mounts.
Enter the Ultimate Performance Rear Shock Mount Kit from ECS Tuning. Not only does our industry-first design alleviate the blowout problem once and for all, but allows rear dampers to fully articulate, for the best possible damper performance and longevity. We accomplish this with no noticeable increase in noise, vibration, or harshness (NVH) thanks to our unique rebuildable polyurethane isolation. The poly bushings not only keep NVH to a minimum, but they also reduce impact loading on the bearing, improving bearing life over full solid mounted monoball designs. To further improve bearing life and longevity, our design incorporates a lower dust seal to keep road debris, grit and other contaminates out of the bearing. Combined with our Heavy Duty Shock Mount Reinforcement Plates, these are the best rear shock mounts available, and the last you will ever need.
Features:
- Maintenance free, PTFE lined, stainless steel monoball spherical bearing for full shaft articulation
- Lower dust seal for improved bearing life
- 80A polyurethane isolation bushings for NVH control and improved bearing life
- Accommodates 10mm, 12mm, or 14mm damper shafts*
- Fully constrained shaft mount makes blowouts impossible
- Anodized 6061-T6 construction for corrosion resistance
- Class 10 black zinc plated studs
- New OEM lock nuts included
- Fully rebuildable design
- Included Reinforcing Plates are CNC machined from 4mm thick steel and black zinc plated for beautiful finish and excellent corrosion resistance.
*For use with factory-style 10mm damper shafts. If you have factory-style mounts presently, you have 10mm damper shafts. Upgraded your suspension and now need spacers for a different size shaft? Also available for use with less-common 12mm (ES2770131) and 14mm (ES2770132) shafts, which can be found on certain high performance dampers.
*During installation a 17ft-lb torque spec is required to avoid damage to the mounts.
- RSM
- Rear Shock
- rear shock mount
- Ultimate performance
- Shock mount
This Part Fits the Following Vehicles
| Make | Model | Submodel | Engine | Special Fitment Notes |
|---|---|---|---|---|
| BMW | E30 | 318i | M10 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325 | M20 2.7L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325e | M20 2.7L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325es | M20 2.7L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325i | M20 2.5L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325is | M20 2.5L | Use vehicle selector to confirm fitment |
| BMW | E30 | 325ix | M20 2.5L | Use vehicle selector to confirm fitment |
| BMW | E30 | M3 | S14 2.3L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ti | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ti | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323ic | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323is | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325i | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325ic | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325is | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328ic | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328is | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S50 3.0L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323Ci | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323i | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325Ci | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325xi | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328Ci | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330Ci | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330xi | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | M3 | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 1.9 | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.3 | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.5i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.8 | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 3.0i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z4 | 3.0Si | N52 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z4 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
Kit Contents
| Description | Brand | Qty | Lifetime | |
|---|---|---|---|---|
| 4mm Rear Reinforcement Plate |
|
2 | YES | |
| Shock Mount Gasket - Priced Each |
|
2 | YES | |
| Ultimate Performance Rear Shock Mount Kit |
|
1 | YES |
This Product Is Covered By Our Lifetime Replacement Program
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New/Unused Product Returns
ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.
In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.
Refused Packages
Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.
Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.
Return Process
ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!
Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.
Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.
All in store credit balances will expire after one year from the original purchase date.
Shipping Policy
Free Shipping On Orders $49 & Up
Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.
Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
Lifetime Replacement
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Click here to learn more.
Why You Should Shop From ECS Tuning
ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.
Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.
Cancellation Policy
At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.
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