Caldwell window balances for non-tilt window

A home owner from Yucaipa, CA says:
Markings on the balances are: 33 3 CO CALDWELL, and 33 2 CO CALDWELL
Channel balance
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Tom from SWISCO responded:
I recommend looking at our Series 385 channel balance, this looks to be a good match. A stamp of 33 3 usually corresponds to our 3330 option, and 33 2 usually corresponds to our 3320. However, one sash should have the same stamped balances on either side.
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