Im needing 4 sets of these springs for my windows. There are 8 windows in my sun porch and only 4 can be opened til I get these teplaced.
Bob from SWISCO responded:
March 30, 2020
This looks like either an S380-18 or S385-18. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 1740.