Corbeau Sports Seats with manual lumbar option and Camaro seat brackets here. Fully adjustable and dang comfy. Had to have a buddy mod the brackets to move the seats inboard a tad to clear the factory seat belt retainers. Got them unskinned and had them covered to match my rear seat.
I also have the Corbeau Sports Seats but have not installed them yet as my car is still in the body shop. Salmon, did you use the Corbeau seat brackets? Can you post some pics somewhere so I can see what they look like and maybe explain how to mod the bracket?
