Eibach spring rubber, durometer 50 (black). This spring rubber is a replacement cushion intended for use with compatible coil springs, offering a medium-soft 50 durometer hardness to affect spring-seat compliance and reduce direct metal-on-metal contact. It’s a straightforward service item for owners refreshing spring mounts or tuning spring seat feel without altering core spring dimensions.
Eibach Spring Rubber - Durometer 50 (Black)