Knowing which type of garage door extension spring to buy can be difficult and the best way to know is to find manufacturer model number for the spring. Alternately you may measure the door height, spring length without loops, and the door weight to find out the spring type you need to replace.
It is important that you replace your old garage door extension springs with new springs that properly match your door weight so you will have a perfectly balanced garage door. If you have broken cables, there is a good chance the extension springs have broken as well. If cannot find spring your size please contact us at HERE.