When fitting out the draw system to our Isuzu MUX, we found the rear-seat bolts to be an odd-size. Unfortunately could not use the factory bolts as they were too short for the base-board we had installed with our draw system.
We found the only size that suited was 7/16″ x 2″ UNF – This was such a weird size in the factory holes.
Champion BC39s
Check on your own vehicle, do not torque it down but we hand-wound these in before tightening down to the base-board.