Window channel balance sash guide

A quick learner from Bradenton, FL says:
I just purchased several 2830 channel balances for my windows. Realized I can't install because the top sash guides are missing. How do I know which ones to purchase? I don't have pictures because they are all broken/missing.
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Tom from SWISCO responded:
You mention that some of the guides are broken. Do you have these broken ones on hand? Seeing one, even broken, would be better than nothing. Also check to see if you have an identical window elsewhere in the house.
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