SRS-Concept - E30 Trailing arm reinforcement kit (weld on) (1764)You want to reinforce your E30 trailing arms ? Make a big update to your rear suspension ? The Z3M Chassis come stock with a little reinforcement between the legs of the rear trailing arms. We have created an updated, ready to weld version for E30. There is no need to remove your trailing arm for this upgrade ! All you need to do is clean the steel surface before welding to insure a good clean weld. Instruction: Clean the weld area. Weld all the parts