channel balance hardware

A quick learner from Escondido, CA says:
July 11, 2016
Just purchase 4 S371-34 : 34" Series 371 Channel Balance units and came to find out during installation that one of the top sash guides was broken which allowed one of the channels to slide up when the window was closed.

Which of your pairs of top sash guides are appropriate for my channel balances?

THanks,

Bill
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Paul from SWISCO responded:
July 13, 2016
Hey, Bill. There isn't any one top sash guide that only works with the S371-34, so it's hard to say. One common choice is the 18-124P, though. Carefully compare this to your current hardware to confirm.
34" Series 371 Channel Balance
34" Series 371 Channel Balance
S371-34
$12.05
Top Sash Guide Pair, Rollyson
Top Sash Guide Pair, Rollyson
18-124P
$3.92
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