I got the OEM roadster sport hoops, and there is a tab welded onto the bar that is used in the topless version, but is over the rear bulkhead in the coupe.

I also had to get a longer bolt for the door-side seatbelt mount.

Nothing fancy, but really holds you tight and allows you to focus on the autocross course and not holding yourself still with either your hands or your feet.

You can see the camera mount between these hoops -- perfect spot, and very stable. My other carmera mount is in place of the passenger side visor.

Mike