replacement sash balances

A distributor from Pittsburgh says:
I have windows with Versa-Sash stamped on the locks the newer sash balance is stamped 3140H with what appears to be TBS stamped perpendicular to the H. Please advise as to what part #(s) I need. I am looking for 10 balances to start.
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Bob from SWISCO responded:

Confirm that the metal channel, not including the nylon fittings on either end, is 32" long. If so, see either our S351-32 or S390-32. 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'll need a stamp option of 3140. 

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