29 9 KW CMC 7 window balance replacement

A home owner from Port Saint Lucie Florida says:
Hi, I'm trying to find help repairing my window's springs because they are failing.

I found a little white stamp in the corner of my window that said Coastal Glass Distributors, so I looked them up their website and found some information. I have pulled the springs out and they appear to be in good shape but I don't understand why they don't hold the window's up.

I have four window's that need the springs replaced (two per window). The window dimensions are 51" X 60-1/2". The spring is 18" on the inside of the assembly and whole assembly is 30-3/4" total.

There is a number lightly marked on the side of the assembly 29 9 KW CMC 7.

I hope this helps. Please let me know if you can help or need more information. Thank you
User submitted photos of a window balance.
A home owner from Port Saint Lucie Florida says:
Ok after reading some of the other post I have gathered more information. The shoe measurement is 1" and I think it's the 15-005. The channel balance is 30". So I think I'm going to need the 30" Series 380 Channel Balance Product Code:S380-30. The weight of the sash is 38 lbs. so that would mean I need the 2965 option. Also the top looks like a 19-005. Does this sound right?
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Tom from SWISCO responded:
Good morning, and thanks for posting! Sounds like you already did my work for me. Your assessment looks pretty on the ball. I would just double check to make sure that all the shoe dimensions match up with your original balance, and that the weight definitely falls under our 2965 option. Other than that, I think you're good to go!
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