Window channel

A quick learner from Tulsa, Oklahoma says:
We have several channels that need replaced. These two are 2830 and 1640. We are hoping they can be replaced.?
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Bob from SWISCO responded:

Do both sized balances have the same nylon fittings? And are the metal channels, not including the nylon fittings, 17" and 29" respectively? If so, see either our S351-17 or S390-17, with a stamp option of 1640, and either the S351-29 or S390-29, with a stamp option of 2830. The only difference between the Series 351 and Series 390 is the bottom nylon shoe depth, so compare both with your old hardware to see what matches best. 

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