Okay, I've figured it out. I jammed a tape down each side and found the metal channels to be 19" each, form where the channel seats to the top edge. Then, I "thinned" a plastic yardstick (you know, the ones they hand out at home shows) and measured around the door opening. Total - 88.5 inches. I measured i three times to be sure, then cut the channel and tired to put it in. Too short. Despite all my measuring of the track. wasn't all that careful with measuring the channel, and cut off 80.5 inches. Crap!!!! Now I'm going to try to piece in the eight inches.
