Window Balance

A home owner from La Mesa, CA says:
The channel (metal only) is 28". The width is 9/16". I think this is a series-351, but I have no idea what weight to get. The picture labeled "stamp" shows the stamp which says "27 9 FP Caldwell". Does this help. I have attached pics.

I would need to order four of these for two windows.

Thank you.

Chris Snyder
User submitted photos of a window balance.
A home owner from La Mesa, CA says:
BTW, I took the window out and it weighed 30 pounds.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. This balance resembles our S390-28 channel balance. With a sash weight of 30 pounds, I also recommend our 2760 option.
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