Ply Gem 5800 sliding glass patio door bottom roller track

Hi-
The roller track, the part that the wheels rest on, for my Ply Gem 5800 is worn "flat spots" on it. The track is aluminum. Pic shows the cross-section view. I included a pic of the rollers so you can see the with of the roller. I'm looking for a replacement track, or a cap that I can put on top of the existing track (that will still fit the rollers). thanks!