48mm Piston Ring Kit For Husqvarna 61 Crank Bearing Oil Seal Cylinder Gasket Set Chainsaw Replacement Spare Part For Husqvarna 61 chainsaw part Replace OEM for 503 53 90 02, 503539002 Piston diameter 48mm Pin OD 12mm Package include 1 x Piston, 1 x Pin, 1 x Ring, 2 x Circlip, 1 x Cylinder Gasket, 2 x Crank Bearing, 2 x Oil Seal