Review on Chamberlain G8808CB-P Garage Door Opener 8 Ft Rail Extension Kit - Compatible with Whisper Drive Plus Models and Includes Replacement Belt by Michael Wilson

If you have an 8ft door, this product is required to increase the length of the strap and track. I'm giving a few stars for value for money because it's quite expensive for what you get, but there's no other way to install a typical tall door garage door opener without this one. This works correctly for professional installers on my Chamberlain B970 opening device. . If you are wondering if a particular Chamberlain opener is compatible with your door, visit their website and download the full manual which will list options, replacement parts and tell you which expansion kit to use with that opener. It's worth noting that this kit replaces the standard strap (included). If one of your garage doors is 7ft and the other is 8ft and requires this kit, you will end up with a replacement for your 7ft door opener strap. something nice in case it wears out.