I have them on a 8 foot door. They stretch out to 71 inches with the door closed seem to work just fine. I do have a safety cable passing through the springs.
Works GREAT ! Bushing for the big drive gear needs to be removed with thin blade screwdriver. Glad kit came with new because it broke. The new bushing needs to be pressed in using channel locks a little at a time.
Part arrived quickly and was as advertised. Good instructions came with it. I had my garage door opener operational in about 45 minutes. Thanks for great service.
My shopping experience went very well. Parts were easy to locate and order.
Shipping was smok'in fast. Install was super easy and the garage door is now working like new again. Will use Preferred Doors again when the need arises. Thanks guys.