I put 3 locations in my setup. We did the minimum distance from the firewall that the plans recommend, I think 3 inches off the FW, then did half the spacing of the blocks. Full forward the pedals are in holes 1 and 3. Middle position they're in holes 2 and 4. Aft most they're in holes 3 and 5. I'm 5'10", the wife is 5'6". We ended up in the most forward location. I use the middle seat mount and she uses the forward seat location with a small pad. I don't like having to use the rear seat location because it sits too upright. Consider the almost a 14 mod if you're 5'11" and want to use anything but the most forward location on the pedals.