Since I need my seat to move, SWIMBO is under 5" and I am over 6", and rise as it does so I fabricated a set of inclined runners using a decent gauge of steel that bolts flat to the floor behind the seat and then, using shaped spacers, rises up to mount on the OEM bar in the footwell. This gives me an inclined, but flat, surface to mount the OMP runners to and then the seat fits to the OMP runners. The bolts fit through spreader plates under the floor to give the security necessary. This allows the seat to slide forwards and rise as it does so that SWIMBO can actually see out of the windscreen! I did have to fit additional eyebolts as when fully forward the angles created by my mounting points were outside that specified in the "Blue Book" and so when SWIMBO drivesI will move the lap belt and crutch strap mounting points. Easily done and got me a few brownie points.