45mm Piston Ring Kit For 154 254 154XP 254XP Chainsaw Replacement Spare Parts 503 50 37 01 Piston ring kit compatible with 154, 154XP, 254, 254XP chainsaw models Replaces OEM part number 503 50 37 01 Kit includes 1 x piston, 1 x pin, 1 x ring, and 2 x circlip Piston diameter measures 45mm May have slight color variations due to and monitor settings Manual measurement may result in a 1-2mm size difference Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.