Window balance

Question

I need both the left and right window balance mechanisms.
The metal channel is 19 15/16 inches long.
The lable/mark on the channel 19 3 GR Caldwell
pictures attached.

Bob · Accepted Answer

Thanks for posting. It looks like you have either an S380-20 or S385-20. 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 balance to see what matches best. In either case, for a stamp option choose 1930.

Comparison of the S378, S380 and S385 balance shoes.