Need help identifying a part please!

A home owner from San Diego, CA says:

I have single hung windows (from MIlgard, I believe), and need to replace the balances. They are stamped "32 9 GV CMC 2". They are 33" long, and 9/16" wide. Can you tell me which part, with which ends I need to specify to replace them?

Also, the windows are 12 years old. I've lived here 7+ years, and the windows have always been VERY hard to lift. Would new balances fix this, or is it possible the weight rating is incorrect? The window weighs 42 lbs.

Thanks for all your help!
User submitted photos of a window balance.
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Tom from SWISCO responded:
Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 380 or our Series 385 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
15-004 and 15-005
A home owner from San Diego, CA says:
Thanks for the prompt reply! If I measure the wshoe width perpendicular, it does seem to be 1 2/32". But the photo of the shoe you sent looks different from mine. Am I correct? I've attached more photos to see if you can help here!

Which weight would my stamp indicate? The 33" Series 385 start with "32 10". If I'm reading my stamp correctly, it's "32 9". If my window is 42 lbs, do I pick a weight to match that, or half of that?

Thanks again.
A customer submitted image of their channel balance shoe.
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Tom from SWISCO responded:
Your shoe doesn't appear very different to me. Where do you see a difference? Based on the depth measurement, it looks like the 15-004 is what you have. Yours just may have been worn down a bit.

As for the weight, you would not divide in half. The options are calculated assuming both balances are carrying the specified load. Now, there are two options under the S385-33 that may work for you. Two balances with the 3270 option can carry a window sash weight of 39 through 42 pounds. However, the 3275 option can carry 42 through 45 pounds. Since your sash weight is right on the cusp, I would re-weigh it just to make sure you get as exact a weight as you can so that you can be sure of which is better.
A home owner from San Diego, CA says:
The parts arrived recently, and they are an exact replacement! Thanks so much for the help selecting the correct part, and the correct options.

Do you have any installation videos or instructions?

Thanks again!
Profile picture of Tom
Tom from SWISCO responded:
Great! I'm glad they match. We do have video instructions, as a matter of fact. Check them out below.
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