Bottom sliding door track

Thanks for posting. Is this for a sliding glass patio door? If so, we carry one type of sliding glass door track, our 80-106. This track is 6' long, but if compatible with your door you could purchase two, adjoin them together and cut off the excess with a hacksaw. The video below shows how to install the 80-106. Take a look to determine if you think this track could work for your door.