OK, I think this is trivial in comparison to what I have seen here but… where can I get another temu-quality plastic flap to fit in this hole? Bonus hugs for Amazon link.
Advice? Buy a replacement.
Since nobody else seemed to read your question, here’s the product. This is the entire vent assembly, but you can swap over just the cover.
Check the sealant on the vent and put some more on the cap when you reinstall it.
That is the exact piece that is missing on my 2020 Cherokee. Literally, just compared the pictures. I found a replacement flap at our local RV dealer (Colaw RV on I-44) but it is not the same flap and does not stay. I asked the parts guy there if they had one specific to the model and he recommended just replacing the vent assy. According to him the manufacturers change the part they use so frequently it’s hard to keep in stock and they’ve opted to stocking whole assemblies instead of the flap. I’d kill for a replacement flap if you find it. Mine wasn’t just straight plastic, it was almost kind of rubbery and was a snug fit so you could push it into the frame and it would stay there, I just forgot to do that one trip coming home and it disappeared.
Amazon sells replacement covers. Just remember to latch it closed before driving so you’re not ordering another one next weekend.
Same thing happened on my Greywolf. Got new one from dealer and applied a bead of silicon before installing. Still there after 4 yrs
Permanently I would get a new replacement one and install it when it arrives. As a temporary solution, I would go to the hardware store and get a piece of expanded metal and attach it in the manner. That is the least destructive but definitely with screws
Google it, order it, install it,
RV lots supply stores, have a parts accessory catalog available most any part can be soursed from it
Source: lost a microwave vent cover on my forest river 18… advice