Mine is mounted in the back wall of my trailer, (rear kitchen) and I am on my third one. The flap keep breaking off on mine. I don't know if it is really a difference or not, but I replaced it with a white on, and it hasn't broke. Possible difference in the plastic??
Anyway you can pick these up at the dealer, or on line. Not very expensive. You will need the water proof tape (cant remember what is called) to properly install it.
2014 Denali 289RK
2017 Nissan Titan XD Pro-4X CC.