I have an never-used/uneeded *aluminum* cover, like/identical shape to the vent in markdoane's pic. You are welcome to it; pm me your info and I'll send it to you, but, if you need it faster, google for "rv refrigerator vent" as these are still made, often plastic now, and very reasonably priced. If you decide you want mine, be patient because I'm away for a few more days yet. In the meantime, if you look at the sideview pic of my AS, below if I'm successful or in my Registry if unsuccessful, you'll see I instead used a fairly standard screw-down Al vent cover for the top reefer exhaust vent. Just inside are two muffin fans (one
12v, other 120v) and it also has screen on the inside to exclude the critters. This vent has never leaked, ever, and that's many years since I installed the reefer, plus, it's my guess that its flat-ish profile has a slipstream advantage over a more-3D vent
.