When I owned a much older trailer (26 years loved when I bought it), I used the catalog from a local RV repair & sales shop.
Nothing was exactly the same as the original, but 'universal fit' stuff could be adjusted easily. Also, if you have some clues as to what needs to be accomplished, quite a bit of stuff at Lowest and Home Despot can be made to work and look nice too.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!