Sash Carrier, 5/8" x 9/16" Bottom Shoe for 3/8 inch non-tilt spiral balance rod 

Carrier Shoe Width: 5/8 inch
Carrier Shoe Height: 9/16 inch 
Material: Plastic 

Priced and sold each. 

Related Parts:
536013 - Rivet 
536201 - Balance Tool, Non-Tilt Window, Single Hook