Chamberlain 7710CB 10-Foot Chain Drive Garage Door Opener Ex

If your garage door is 7 ft the original rails will work. If your door is 8 ft then order the 8 ft rail extension kit. If your door is taller than 8 ft up to 10 ft this kit will work. My door is 8 ft 10 inches tall and the 7710Cb-P / 7710Cb rail extension kit installed and worked perfect. The rails included in this kit fit with no issues. I did remove 2 links from the chain in order to properly adjust the chain tension. Simple enough. Works great.

bonne qualité, moins que l'original, mais 20 ans plus tard, la qualité est diminuée partout...

Quiet operation, Very easy to install, perfect fit. Great quality. My garage door opener fit up to a 7' door, my door is 10'. I installed this extension kit and it works perfectly.

Did the job, what I was looking for, available on Amazon when it was not available anywhere else. Thanks Paul

Fit as expected.