Genuine Andersen Part. Genuine Andersen Top Springs Available, search for # 1997196. Andersen Gliding patio door insect screen lower wheel assembly. For units manufactured prior to 1991. Screws included.
Andersen 737 Narroline Sash Balancer silver
Works with Perma-Shield Narroline Double-Hung Windows manufactured from 1968 to Present. Match your windows (lower sash) visible glass size (width & height) to the chart.