Narroline 1970s sash balance

Question

I have the Narroline double hung windows from the late 1970"s.  Need to replace sash balances on two windows identical in size.  The visible glass is 36 3/8" wide by 15 9/16" high for both top and bottom.  What sash balance should we need to replace it.

Paul · Accepted Answer

From your dimensions, we have concluded you have a 3432 Anderson window that uses a 24-837 sash balance.