This roller is discontinued and can be replaced with #13061. It looks totally different but works great. 

1-1/2 inch nylon ball bearing roller 
Adjustable diecast housing assembly 
Pressure cast zinc for strength. 
Used by Nudor and other glass door manufacturers 
Housing dimensions: thickness, 11/16 inch; length, 1-5/8 inch; height, 7/8 inch. 

Sold each, priced each 

Diameter: 1-1/2-inch 
Housing Tab Style: Unique Housing 
Housing Width: 11/16-inch 
Material: Nylon 
Roller Diameter: 1-1/2-inch 
Roller Edge Type: Concave 
Roller Material: Nylon 
Roller Width: 7/16-inch 
Type: Concave 
Width: 11/16-inch 

Related items: 
13061 - Alternative replacement roller