Preload MTB Mountain Bike Rear Suspension Shock Absorber AL 6061 Coil Spring 750 lbs with Extra Bushing - Black 160mm. Dark Hard-anodized Al-6061 “in One Piece” Shock Body, Riding style XC / Electric BUSHINGS INCLUDED: Top bushing size: 8mm x 24mm; bottom bushing size: 8mm x 24mm and extra bushing 8mm x 50mm length.
eBay