Mike,
I'm using a stock seat with the 5-point harness. I cut a hole in the
seat back for the shoulder belts to pass through.
The shoulder belts mount(wrap around) to the back brace on the roll bar.
The lap belts mount to the factory lap belt locations, and the submarine belt
mounts to the brace that the front of the seat rails bolt to.
Guy,
All you need is a 5-point roll bar for 11's. The main hoop, two rear braces,
and a door bar on the drivers side.
Don