'92 Jayco faucet parts?

There are two major brands that were around back then- Utopia and Phoenix. The new Utopia replacement cartridges look almost the same as the older ones, but are not interchangeable. The old ones have an O ring as a washer, new use an actual washer. Phoenix could be plastic washerless cartridges or brass, which can be rebuilt with o rings and washers.

Best bet is to take the cartridge to a good hardware store, or an RV dealer.