1-1/2 Steel Wheel Roller Assembly;
The 13025 has an 11/16 to 13/16 Flair and the 13026 has an 11/16 to 3/4 inch flair, basically the same item.
The original is not available - this can be used as replacement

Sold each, priced each

Diameter: 1-1/2-inch
Housing Tab Style: Plain Back
Housing Width: 11/16-inch
Material: Steel
Roller Diameter: 1-1/2-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 11/16-inch

Related items:
13025 - Steel Wheel Roller Assembly ( 11/16 to 13/16 Flair)
13026 - Steel Wheel Roller Assembly ( 11/16 to 3/4 inch flair)

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