replacing door holder

Amazon - search RV door holder. Check etrailer, too.

I assume you want a door holder or door retailer or door catch.
This is the best I found on Amazon.
It may be the same as stock, but really I have not done the research.
Good Luck

Update on Door Stop Retaining Catch
I just replaced both of my door stops due to wear on my 2018 T@G 5 wide.
They were a perfect match and all that was needed was to remove and replace.
I used silicon sealant in the holes and screws for water protection and screw retention. (silicon is just an option)
A very easy fix.
I would recommend

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