I had to have the door modified .they replaced the rails so the door goes up tight to the ceiling. The new opener mounts to the operator bar in the corner so you dont have the opeerator rail in the middle.new operator can be adjusted to stop door where ever you want,I had to adjust my 8' door to stop at 7' because my garage is 24' deep and the door would hit if the car was up at max height,not a problem my wifes mountaineer can clear 7'.