Replacement window ballast

Thanks for posting. Is the metal channel, not including the nylon fittings at either end, 30"? If so, I believe you have either our S380-30 or S385-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the image below. Compare both measurements with your old hardware to see what matches what you need. In either case, for a stamp option choose 2940.

Comparison of the S378, S380 and S385 balance shoes.