The seat rail bushings wear; causing excessive seat movement. The poor quality bushes within the seats sub frame tracks wear, perish or completely disintegrate and ultimately fail causing excess movement in the rails. Fit our upgrade seat runner bushes and stop the excess movement in your seats. our part will not deteriorate like the bushes and are designed to last the lifetime of the vehicle.An extremely common fault fixed with our repair kit. for Vehicles affected and part numbers Z3 coupe All Z3 models Z3 E36 E37 E38 1994-2002 Roadster and Coupe Z3M M Roadster M Coupe Associated part numbers: 52108401291, 52108401292, 52108399593, 52108398812, 52107137499. colour:Silver Material:rubber Package Contents: 8x bushing Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.