last year i bought 90430-37140 as a replacement seal for my 4/1995 cruiser.
i see no reason why it wouldn't fit perfectly, if i could manage to get the old hardened gasket out of the cap! if i didn't know any better, i would say there isn't even a gasket in the cap as the gasket material and...
i bought a new rubber seal for my oil cap. the old one is solid like a rock
however when i went to replace it, i chickened out due to fear i'd completely destroy the cap in the process. i intend to buy an entire new cap instead.