Product review (4 stars): A bit 'deep' - this seems to be sized for ...
A bit 'deep' - this seems to be sized for older trailers with thicker walls.  I needed to trim it a bit, but a sharp knife and a pair of pliers took care of that.

I could wish for the 'damper' flap inside to be a bit more durable on the hinge pins.  Hopefully we won't break another one.