283 EX CMC 7 Channel Balance

A quick learner from San Jose CA says:
I need the following sliding window channel balance - model 28 3 EX CMC 7.

What part should I buy? Thanks!
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Emily from SWISCO responded:


With this combination of attachments, you could have either an S380-29 or S385-29 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a 2830 stamp option.

If you have any questions just let us know! 

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