help identifying balance

A home owner from Vero Beach, FL says:
I took apart one of my windows - the balance just broke - and I need to but a total of 6 balances (planning for the future).

The ID info stamped on the side is 29-4 KX CMC 9.
The length (metal, no plastic ends) is 30"
The weight of the window is 16.4 lbs.

I am including photos from all angles.

Please advise what to buy, and how to do it.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Al. I recommend looking at our S385-30 channel balance. Just make sure the sizes of the nylon attachments match!

Can you also confirm the weight of the sash? Your stamp corresponds to our 2940 option, but that carries a sash weight of 23 through 28 pounds. You say your sash weighs 16.4 pounds, which would be more like our 2930 option. I would double check before you make a decision, just in case.
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