38 mm Piston assembly with ring Chainsaw Parts 1130 030 2004, 11300302004 for 018, MS180 chainsaw ST1800638 mm Piston assembly with ring for 018 ... , HUS 350, HUS 365, HUS 61, HUS 268, HUS 272. 38 mm Piston assembly with ring Chainsaw Parts 1130 030 2004, 11300302004