I've seen that done on the front belts, but the cage in the rear is a little low for mounts, especially if I put buckets back there. I plan on extending the cage a little anyway to give rear passengers a little noggin protection as well and will take that into consideration.
Also sounds like I have a good double wall (the less desirable) and a crappy single (the one everyone wants). Great.
Good thing I'm sticking with the old Kayline softie until I get new paint and a new fasttrac soft top.