Fits Peerless patio storm doors - single pane glass.

1-1/4 inch steel ball bearing wheel
Adjustable diecast housing assembly
Used by several glass door manufacturers
Housing dimensions: thickness,11/16 inch; length, 2-11/16 inch; height,1-1/8 inch.

Diameter: 1-1/4-inch
Housing Tab Style: Unique Housing
Housing Width: 11/16-inch
Material: Steel
Roller Diameter: 1-1/4-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 11/16-inch
Top Screw Size: 10/32
End Screw Size: No Threads,  Not tapped - Manufacture used self tapping screws on this roller 
Priced each, Sold each

Helpful Article: How to Replace Rollers in an Aluminum Sliding Glass Door