Mirrored Closet Door bottom track

The best replacement option we have for your track is our concave style roller track. These are only available in three different lengths, the longest being 72" (or 6ft). 

Given that, my best suggestion would be to purchase two 59" tracks (or any combination of the three available), and then cut them to size. You'll need to install them so they'll sit flush and won't interfere with the roller/guide.

Profile view of bottom concave roller track