Channel Balance Help

A quick learner from Jacksonville says:
I have Kinco Windows from 1988 in my home and the balances are wearing out. I have removed a pair and they are marked 28 3. It appears that I need 28" 390 Series balances. Based on the pics attached would you concur that I require a pair of 2730 balances? Is a 2730 actually 30 inches long?

Thanks in advance.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Based on your stamp, I believe that our 29" long balance is the better match. I would double check the length of your metal channel just to be sure.
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