Channel Window Balance Replacement

A handy person from Portland Oregon says:
The metal portion of the balance is 27" long. I need to order a pair to replace failed units in my son's home (San Jose, CA).
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Can you double check the length? Based on that stamp, it should be 28" long, not 27". If so, I recommend our S350-28 channel balance with a 2740 option. Let me know what you think.
A quick learner from Portland Oregon says:
I didn't believe my own eyes when reviewing the pictures I took. You're right; it's 28". The two balance units have slightly different stampings on them: The stamps are is "27 4 CALDWELL DM" and "27 4 CALDWELL EM
Profile picture of Tom
Tom from SWISCO responded:
I wouldn't worry about that. The only important digits in this case are "27 4," which corresponds to our 2740 option. The rest of the stamp is just a manufacturing code and doesn't have any bearing on the function of the balance.
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