BSI 2640 window balance

Thanks for posting. See either our S380-27 or S385-27. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. In either case, choose 2640 as a new stamp option.

Comparison of the S378, S380 and S385 balance shoes.