Discontinued and limited to existing inventory
Alumax Patio Screen Door Roller Assembly with 3/4 Oval Wheel

Wheel Diameter: 3/4 inch
Wheel Shape: Oval
Roller Type: Ball Bearing
Roller Material: Nylon
Bracket Material: Zinc Die Cast
Bracket Length: 2-5/16 inch
Bracket Width: 7/16 inch

Roller itself can be replaced with 18000 (3/4 x 1/4) if you can re-use the bracket.