Calhome replacement rollers can be used to mount another door to an existing track, or upgrade/replace existing rollers
 
 
 
Single (one piece) replacement roller
 
 
All mounting hardware included
 
 
Made of high quality steel
 
 
Replaces rollers for Calhome Items #: SDH-SWD11-AB-79, SDH-SWD11-SK-72, and more
 
 
Works on flat rail tracks