Superior Parts SP 878-303 Aftermarket Piston Bumper for Hitachi NR83A, NR83A2, NR83A2(S) - 883-511, 878649, 877376 (5/Pack) Pack of 5 Yellow color Piston Bumper Aftermarket Piston Bumper for Hitachi NR83A, NR83A2, NR83A2(S) - 883-511, 878649, 877376