LEGO Large Shock Absorber with Very Hard Spring (15035 / 18405) | Brick Owl - LEGO Marketplace
Self Locking Brick MOC Building Blocks Bulk Technical parts Shock Absorber 9.5L (Hard Spring) 4pcs Compatible with Lego 18405|Model Building Kits| - AliExpress
BrickLink - Part 731c05 : LEGO Technic, Shock Absorber 6.5L - Normal Spring [Technic, Shock Absorber] - BrickLink Reference Catalog