Bay door latch

Go to Creston RV in Crossvill tn, Bill has them.

I get Fleetwood style latches on ebay

Yes!
On these latches most, if not all of the manfacturers use is really junk and break all the time, and the replacements are the same. Often the cause is how the user slams them shut, but not only always.

MotorHomeLatches.com machines those lousy plastic catches out of metal. You can buy them complete or rebuild kits. I've done both and the kit isn't worth the few $$ saved.

HERE is a post I did on iRV2 on the Winnie latch fix

Understood that yours is a National but that doesn't mean one of these replacements isn't that

cableguy574 wrote:
My door latch lock mechanism, has broken the plastic latch. Does anyone know where to get a new one

a picture is worth a thousand words ? any chance of one
way too many latches out there-- Plastic?