Replacement lower bipass door track

Thanks for posting. It looks like this track does not have grooves, but rather 'raised' rails to work with concave rollers, is that correct? If so, I believe you may be able to use something like our 23-270 and the other-sized lengths we have on this page. See the diagram below, compare the cross-section dimensions to your old track, and see if you think you could get this to work for you. For a 14' enclosure, you could use (1) of the 71" 23-272 tracks and (2) of the 23-270 47" tracks. This would come out to close to 14' of length. Let me know what you think.

Profile view of bottom concave roller track