Chris
The best and easiest way to do it is to use the Planted Bracket
http://www.xplosiveperformance.com/C...er_p_3305.html this bracket will mount to the floor using the stock seat mounting studs (no Cutting or fabing) then the side brackets mount the seat to the planted and your done. You can mount the sub belt to the planted bracket there is slots cut in the planted to mount to. The Schroth belts come with all the necessary hardware to mount the belts. The lap belts can get mounted a couple ways. Are you trying to keep your stock belts? If so Brey Krause makes a belt adapter that mounts to the seat and retains stock belts. If you don't care about stock belts then most will mount the laps belts to the floor with the eye bolts supplied. If you do that make sure you put the eye bolts in the steel support plate under the car where the factory seat bolts to. I know sounds like a mess its not call us and we can walk you thru it