For you '65 owners who need a latchset and/or deadbolt and don't mind "not original". . . .
I just ordered a Schlage A Series passage lockset and deadbolt (DLock B660P), satin chrome, both 3 3/4" backset. I am pretty certain (ie hoping) that they will do the job on my '65 Tradewind. The latch mechanism from a 2 3/4" backset latchset that I have fit in just fine without cutting anything.
I ordered the Plymouth, although the Andover or Georgian match original pretty closely.
I will have them in a few weeks and will report on success.