Winnebago commonly used the TriMark 30-0900 for their OEM applications back then. It's also referred to as 17217-02.
Take a look at the inside of your interior handle for a 5 digit code. If the code is 11928 or 21397 or 13428, then it will use the TriMark 30-0900.
I've attached an image of where the code will be located
(from Pacific Rv Mirrors)
Once you have verified that the TriMark 30-0900 is the one you need, post again and maybe we can help you locate a vendor to purchase what you need (Pacific does stock them, however).
Also, take a look on the Winnie Owner's forum (spin-off of iRV2) as they have several threads on door locks and there are a several good posts suggesting ways of "fixing" any problems before deciding to replace the entire door lock.
Here's one of those posts:
go HERE
And here are a few other threads over there but there are a few others too:
Replaced my TriMark 030-0900 entry door & dead-bolt lock hardware
Locked Inside (Or Out) Of Your RV? * Trimark 30-900 Lock * How Do These Things Work?
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(from Pacific RV Mirrors)
Linear Mode
