Mirror closet door track 8' long

Thanks for posting. it looks like you need a track for concave rollers, or where there are rised rails for rollers to roll on. See the 47" 23-270, 59" 23-271 and 71" 23-272. The overall design is a bit different but if the distance between the rails is the same, these could work for you. We don't carry an 8' version but you could adjoin two of these tracks together then cut off the excess length with a hacksaw like the 75-023A. See what you think.

Profile view of bottom concave roller track