Self-locking Bricks Moc Building Block Technical Parts 1pcs Technical Shock Absorber 9.5l (hard Spring) Compatible With Lego - Model Building Kits - AliExpress
How to increase Lego Technic Shock Absorber stiffness - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Bricker - Part LEGO - 731c05 Technic, Shock Absorber 6.5L, Complete Assembly - Normal Spring