At one point I tired a different seat ( We had 4 we mocked up, Sparco, etc) The tracks on the GT seat are very low. We did not find any extra room with a bolt in solution. The aftermarket track is you want the seat to slide was higher than the GT's, off setting the space we picked up with a thinner pad. I have seen a Kirkey Alum seat that was modified to work, but not the most elegant solution, but good for the track. Bruces' suggestion seams to be the easiest and most cost effective solution I know. Well, short of the Bubble, but I think that was a fairly expense mod at one time. BTW who does the bubble mod now?...Is Saleen still in business for that sort of thing?.