Rebuild kit fits 503 engines.  Standard size piston, full gasket set with seals.  Includes 2 pistons, 2 ring sets (2 rings per piston), 2 wrist pins,  2 wrist pin bearings, 4 circlips, crankshaft O-rings/ plugs, 2 base gaskets, 2 head gaskets, 4 exhaust gaskets, 4 intake gaskets, MAG and PTO seals. Piston is Teflon - molybdenum coated to reduce friction, resist seizure and improve durability.

Standard size piston (71.93mm). Over size available at same price, contact us for .5mm oversize. 

This kit is for 1989 and older engines which have smaller MAG seal.