Window Channel Replacement

A quick learner from Hayward,CA says:
Looking for a window channel replacement for a 21 4 Caldwell part 46 by 23 window.

I need to replace the broken one, plus three others.

I also need a replacement for another window that's 35 by 29.
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Bob from SWISCO responded:

Does the top nylon fitting have wings, like our 19-005? If so, take a look at either our S380-22 or S385-22. The only difference between these two balances is the bottom nylon shoe depth, so compare both with your old hardware to see what matches best. If the top nylon fitting lacks wings, like our 19-002, then see the S350-22 instead. In all cases, you'd need a stamp option of 2140. 

For the other-sized window, I am afraid we need to see the balance out to help. Pictures of the nylon fittings on both ends and the stamp code on the metal channel will help us ID what you need.

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