Alcan aluminum window 60 series sash guide in white.
Fits Alcan series 437-438 window.
7/8 inch wide at top.
5/8 inch wide at bottom.
Screw hole from bottom of guide is 3/8 inch.
Uses a 60 series Channel Balance. Uses 60-508 and 60-503 Shoes.
Priced and sold each.Resources:
Article: How to Replace Channel Balances
Video: How to Replace a Channel Balance
This product is similar to or the same as the following part numbers in these brands:
Strybuc Industries: 900-18140W