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I have three belts in the rear seat. I bolted them to the floorboard which is 3/4" plywood with a 3/8" bolt, the plywood is bolted to the frame of course. Then on the bottom I put a huge 2" diameter flat fender washer, lock washer, and nut. The flat washer gives you more surface to tighten down on. I bought the belts at a parts store with the floor brackets already sewn on. Standard lap belts.