identify my channel balance

A professional from Las Vegas says:
Please help me identify my channel balance. The metal parts are 27" x ½".

I believe that it has 19-005 and 15-005.

It has "26 4 BW CMC 4" printed on it.
User submitted photos of a window balance.
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Paul from SWISCO responded:
Hello! I would double check the size of your shoe. It looks more like 15-004 rather than 15-005. If it's 15-005, then the Series 380 is your best bet. If it's the 15-004, then our Series 385 would be better.
A quick learner from Las Vegas says:
Thanks for the help. 15-004 and 15-005 appear identical to me.

With "26 4 BW CMC 4" should I get the 2640 19-26 lb. version?
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Tom from SWISCO responded:
They appear identical, but they have a slight difference in size. Eyeballing yours makes me think our 15-004 is closer but you will have to measure yours to confirm.

A stamp of 26 4 usually corresponds to our 2640 option, yes.
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