need help identifying part

A contractor from west palm beach says:
March 9, 2015
Hi,, I have some windows that the spring balances do not work, they are the 2320 balances. The reason they do not work is that the stop at the end of the window is snapped. I have attached a picture of an intact stop, please can you help identify it as I need at least 10 of them. thanks
User submitted photos of window hardware.
Profile picture of Paul
Paul from SWISCO responded:
March 12, 2015
Based on your pictures, I recommend our 18-042 top sash guide and S377-24 channel balance (with a 2320 option). Carefully compare this hardware to your own to confirm that they match.
Top Sash Guide Pair, Pan Am
Top Sash Guide Pair, Pan Am
18-042
$1.97
24" Series 377 Channel Balance
24" Series 377 Channel Balance
S377-24
$10.77
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