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E21 Rear Trailing Arm Bushings

For the rear trailing arm bushings I found four real options (short of making your own). Again, parts I carry are priced in orange.

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Stock: They are cheap, and they are for sure better than the 20 year old rubber that is probably in there. P/N 33329061945 Cost: $42.00

BMP Urethane: Only slightly more expensive than stock. These bushings offer much more stiffness over the stock bushings. Cost: $60.00

BMP Urethane Offset/Adjustable: These allow for slight adjustments in camber, however they are very expensive compared to the previous two options. Cost: $235.00

Korman Derlin Bushings: Derlin is more stiff than urethane, thus these bushings are more effective than the urethane mounts. These mounts are also in upwards of $200 for the set, and interestingly they are not adjustable.

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My Choice

I chose to go with the BMP urethane bushings. (Pictured below) Their low cost is very appealing, and I am not convinced of the effectiveness of the adjustable bushings (I was not too interested in adjusting them either). Additional negative camber will come when the car is lowered through sport springs. The Korman bushings while very appealing, I could buy the rear shocks for what they cost. The BMP urethane bushings were the best compromise.

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