All of our new parts are aftermarket replacements. Compatible with Minneapolis Moline Tractor(s) G850, G940. Compatible with Oliver Tractor(s) 1650, 1750, 1755, 1800 (engine s/n 124396-later), 1850, 1855, 1950. Compatible with Waukesha Engine(s) G283, G310. Contains all gaskets necessary to complete an overhaul that are not included in the head gasket set. All States Ag Parts Item No.