The rear A/C is beyond and about half behind the fridge vent in the pic and they are both black, but its there.
Looks like Don has a Norcold fridge. The RV manufacturers use the same brand vents as the brand of fridge (for warranty purposes) and Norcold side wall vents have the two fasteners to unlatch them on the top, while Dometic puts the turn buttons on the bottom. I can see the two above the top slot when I blow up the original pic, and the Norcold roof vent has a very sloped or raked front to it, which this does. Dometic roof vents are symmetrical with the front and rear being the same.
Click the pic, it will blow up rather large.
Charles