Well, I kinda went about it the hard way. I sliced and diced the ramps in the floor where the bench used to sit, flatteniit out and welded it back together. Cause I wanted the seats to sit as low as possible.
But if had it to do over again, I would just build a frame out of 1x1 tubing and adapt the seat to the floor. I'm thinking right now about raising them up an inch or so.