Special Order. Non-Returnable

Commercial Door was sold by Columbia in the 60's -- Manufacturer = Ador.

1-3/4 inch steel ball bearing roller Steel housing (side plate on each side of bearing)
Steel gear with adjustment screws
Housing dimensions: thickness, 5/8 inch; length, 2-1/4 inch; height, 1-9/16 inch.

Diameter: 1-3/4-inch
Housing Tab Style: Unique Housing
Housing Width: 5/8-inch
Material: Steel
Roller Diameter: 1-3/4-inch
Roller Edge Type: Concave
Roller Material: Steel
Type: Concave
Width: 5/8-inch

Priced each, sold each

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