
Above is a Sparco Evo seat I have in my racer.. by using Sparco Pro Ali seat mounts you can notch out the rear of the mount and have the rear base of the seat directly resting on-top of the rear cross-member.

Shot down back of seat (it could be moved back another 1/2 inch based on the mount modification.

Shot showing under seat space.. NB. the front of the seat is canted up so for a more reclined position

My seats are stock trim.. but this could be changed easily for matching leather.. personally I quite like the racer look.. similar to the Sabelt seats in the Roadster Lightweight racer.