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I have a couple parts in my rebuild gasket kit i cant identify.
Copper 1/2 inch washer
Rubber washer about 7/8 inch diameter and 1/2 inch thick
Cork gasket about 3-4 inches in diameter with 6 holes around it (like 3/16 holes)
The copper washer could be a couple things, if it is just one, it may be a spare drain plug washer, if there's 8, they may have included a set of injector washers.
The rubber washer, is it grooved like a grommet? It could be a CDR grommet....