For T4, T4.1 Front, SC10 Front, GT2 Front. ?V2 shocks are compatible with all current RTR and Factory Team shocks on B4, B4.1 , T4, T4.1, B44, and SC10. ?Easy-to-build seal package. Simplified build uses two O-rings and one spacer. ?Threaded lower seal cap made of low-friction material and acts as a guide bushing. ?Designed to last longer between rebuilds. ?Threaded shock collars with O-rings to keep the settings secure. ?Works with existing shock shafts, pistons, O-rings, shock ends, spring cups, and shock caps. ?Included in package: bodies, threaded collars, collar O-rings, seal cap, seal spacer. ?Contains parts to convert one pair of existing shocks.