Window channels and top sash needed.

A home owner from Albuquerque, NM says:
April 12, 2020
28 inch 1/2 channel balance with 2740 inscribed on it and top and bottom inserts as shown in the pics. Please advise on correct replacement part. I believe it would be the S350-28 with 2740 option and 5/8" top sash guide.

Thank you
kevin
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Bob from SWISCO responded:
April 15, 2020

Hey Kevin. Double-check the length of your channel balance's metal channel. Be sure not to include the nylon fittings in this measurement. If it's 28", then you need the S350-28, with a stamp option of 2740 just as you thought. For the Top Sash Guide, see if our 18-009 matches what you need.
5/8" Top Sash Guide
5/8" Top Sash Guide
18-009
$0.99
28" Series 350 Channel Balance
28" Series 350 Channel Balance
S350-28
$10.97
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