Tandem Sliding Patio Glass Door roller assembly with 1-1/4 inch diameter wheel, tabs on both sides and end adjustment.
Uused by Croft, VinylMax and others

Style: End Adjustment Tandem Roller
Roller Diameter: 1-1/4 inch diameter
Roller Width: 5/16 inch
Roller Type: Concave wheel
Wheel Material: Stainless Steel
Adjustment: End of roller has Phillips head Screw

Installation screw holes spaced at 5-3/4 inches.
Housing 4-1/2 x 1-7/16 inches.
Priced and sold each.

NOTE: Several of these look the same but have different wheel diameters housing thickness and housing heights - Please compare measurements