Fits on Harcar Doors 
This Sliding Glass Door Roller Assembly has a 3/4 inch (19.1 millimeter) wide, 1-9/16 inch (39.7 millimeter) tall adjustable steel housing assembly. The steel ball bearing roller is 5/16 inch (7.9 millimeter) wide.
 
The assembly fits on doors by Harcar and many other patio door manufacturers. Minimum Order: 1 Package Each package contains one roller assembly.