inside latch/lock for '78 Argosy Minuet

[ArgosyMinuet]

Looking for an inside door latch/lock for my '78 Arogosy Minuet. I called Airstream and no part is available. Should I go to hardware store/lock store? Any suggestions?

[Argonaut20]

Give Inland RV in CA a call. Andy has a lot of old parts and parts that can be made to work when the old, unavailable parts fail. The outside latch mechanism for the Minuets is no longer available but it can be refitted with a different latch mechanism that will work. If it is just the inside handle that is AWOL, that can be replaced without replacing the latch mechanism.