replacement channel balances for milgard sash windows

A quick learner from ramona, ca says:
Stamp on current channel balance: 26 4 DP Caldwell
Weight of sash: 19lb
Size of sash: width 34", height 30"
Length of metal channel balance: 27"
Width of metal channel balance: approx. 1/2"

I am thinking we need your:
Series 370 Channel Balance Product Code: S370-27
Model 2640.

Am emailing to confirm my choice before ordering.

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Tom from SWISCO responded:
Hey, Lance. I'm afraid I cannot confirm if the S370-27 is a match. I recommend carefully comparing the pictures and dimensions we show for the nylon attachments that come with it to your own parts to confirm if this is the same.
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