I've got what I think is a CJ5 rear seat (not 100% sure though) to fit into Dogface. Unfortunately it doesn't have the mounting brackets with it and I wondered if anyone has a picture of what they're like? Under the seat there is a round tubular front and rear rail approx 1" dia welded to rectangular side rails which are about 2" deep. I'll try and get a photo tomorrow when its light.
The alternative is to use some of the bucket seat side mounting brackets like those made by the likes of OMP and Sparco.