Help with channel balance identification

Question

I previously ordered this part from swisco:
S390-29 - 29" Series 390 Channel Balance
This was for larger windows. I have same window style, but a bit smaller, that also need replacement channel balances. What would be the right part# for the channel balance replacement on the smaller windows? See pictures.

Casey · Accepted Answer

Hello,

If these balances have the same end fittings as the S390 shown below, you would be the S390-21 with 2040 strength options based on your stamp code. If you notice any discrepancies, please get back to us with photos of both ends of an intact balance removed from the window. Thank you!

Close up view of the S390 balance top.

Close up view of the S390 balance shoe.