Replacement Window Balances

Question

I have four windows needing replacement balances, but I'm a little confused which S??? part number to select. Using the attached photos, can someone please help me identify the correct ones to order?

Bob · Accepted Answer

Thanks for posting. This looks like either an S380-30 or S385-30 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best. See the diagram below for reference. In either case, choose 2950 for a new stamp option.

Comparison of the S378, S380 and S385 balance shoes.