Window Channel Balance S350?

A home owner from San Diego says:
Is S350 the right type for my window channel balance?
My width 1/2".
My metal only length 34".
Number stamped: 3330.

Is top sash guide 18-110 the right type?
My measurements as per your website picture seem to match.

Please see the attached pictures.

Thanks
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Casey from SWISCO responded:

Hello,

Based on your photos, I agree that you could have the S350-34 channel balance, which comes with the 19-002 top and 15-004 1-3/32" deep bottom fitting. As long as those match your original assembly, you'll be good to go.

As for your top sash guide, it looks similar to the 18-166 but you'll need to compare the dimensions to confirm. This will be the deciding factor to determine if these parts will work for your repair. Thank you. 

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