Self Locking Brick MOC Building Blocks Bulk Technical parts Shock Absorber 9.5L (Hard Spring) 4pcs Compatible with Lego 18405|Model Building Kits| - AliExpress
LEGO Technic - 6.5L Shock Absorber x 4 - Hard Spring - Yellow - New (731c04) | eBay
LEGO part 48912c01 - Yellow Technic, Shock Absorber 11.5L, Complete Assembly at BrickScout