If your PO was like me, the OEM part broke ( you should see two holes where it was removed). If they are not adjusted perfectly they will snag making the outside door hard to open and eventually they break. We were out for dinner one night and I didn't have time to tinker with it, so I broke it to open the door. I then took mine off for a while while trying to order parts, the closest dealer did not stock and the $20 part was like $50 when you add all the shipping.
I bought this one off ebay
https://www.ebay.com/itm/154607888623 for $11 and it fit well. I have had about two years now with no issues, I ordered a 2nd one as a backup. They are very low risk and in worse case; you may drill one hole so that it is on perfect center. In my book, I could have 5 of the replacements for one OEM that had already proven to not last very long (maybe 16 months before failing?).
FWIW, and if you into engineering, the replacement is designed better as the latch catch is rounded not square like the OEM so it makes it easier to release away from catch plate and not snag when/if adjust is lightly out of alignment.
Update: If the part that actually affixes to the outside door is gone, this replacement may not work for you. I just remembered in my case it was only the handle assembly that broke and I only replaced it. I mounted the new handle from ebay onto the screen door, I still have the OEM parts on outside door and OEM strike plate on RV door wall to catch handle.