Post photos of what you need. Many RV parts are shared in common across many brands. Someone may recognize what you have as what they have or recently had to replace.
As for the door latch, I'd take it off and head to my friendly neighborhood RV dealer's parts department. They may have something that would work, or may be able to use numbers on the old piece to track something down for you. Again, I doubt your lock was proprietary to your brand/model.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad