Window Balance Replacement

A quick learner from San Diego, CA says:
Attached are three pictures from a balance I need to replace. The only markings are 26 5 KW CMC 1

Thank you for your help.
User submitted photos of a window balance.
Profile picture of Donna
Donna from SWISCO responded:
Take a look at SWISCO product code S385-27 and compare the measurements of the fittings and channel length to your sample.
Next, I believe you might need 2750 stamp option, to check, please remove the window sash and place it on a scale. A pair of 27" Series 385 balances, with stamp 2750, will carry a window sash weight range of 26 through and including 30 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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