Discontinued Item:
Adjustable steel housing assembly, 1-1/4 inch steel ball bearing roller used by mid-continental and other glass door manufacturers.
Housing dimensions: thickness: 3/4 inch, length: 2-3/8 inch, height: 2-1/16 inch.
Diameter: 1-1/4-inch
Housing Tab Style: F-Tab
Housing Width: 3/4-inch
Material: Steel Roller Diameter: 1-1/4-inch
Roller Edge Type: Concave
Roller Material: Steel
Type: Concave
Width: 3/4-inch 

NOTE: Replacement Options
Best replacement option #1: Replace with #13183 Roller Assembly - Install 10/32 Screw thru top. and 1/4-20 frame screw. Set roller back about 3/4-1 inch from edge of door. Install Drill hole and install top screw

Option #2: 1-1/4 Wheel only #13204 or #13272 Nylon with new axle pins (many times the existing housing is worn and the roller assembly, option 1, is a better repair)

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