Window Channel Balance Replacement

A quick learner from California says:
I am looking to replace the channel balances on most of my windows as the majority of them are failing. I have attached photos of the balances. There are three window sizes I am working with so there is one of each photographed.

The window sizes are (Qty=number of windows):
34"W x 70"H - Qty 10
28"W x 70"H - Qty 4
16"W x 46"H - Qty 4

Please provide your recommended part numbers and pricing.

thank you,
Jason
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Bob from SWISCO responded:

Thanks for writing in. Please confirm that the length of the balances marked 21-2 is 22" long, and that the balances marked 33-4 and 33-3 are 34" long. If so, then you need either our S380-22 and S380-34, or our S385-22 and S385-34. The only difference between these two balances Series is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to confirm what the best match is. You will need a stamp options of 3330 and 3340 for the 34" long balances, and a stamp option of 2120 for the 22" long balance.

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