Need replacement channel balance for Kinco window with marking 29 9 GW CMC 11

A home owner from Trinity, FL says:
November 12, 2016
I would like to order the channel balance for my non-tilt window. The width of the leaf is approx 51 inches and the height is about 32 inches. I believe my window's brand is Kinco. The current balance has the following numbers stamped: 29 9 GW CMC 11. Am I supposed to order a 28 or 29 lbs? Are those numbers good to determine the right sash weight? What part number should I order? Please let me know. Thanks.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
November 15, 2016
Take a look at our S380-30 channel balance, this may be a good match. I would just go over our dimensions to confirm it's the same.
30" Series 380 Channel Balance
30" Series 380 Channel Balance
S380-30
$11.30
5/8" Top Sash Guide, Kinco
5/8" Top Sash Guide, Kinco
18-166
$1.33
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