Replacement for Caldwell Balance

A home owner from Redwood City, CA says:

I have a Caldwell Non-Tilt Window Channel Balance with the following marking "27 3 F0 CALDWELL". Looking at the ends on the balance, it seems to match series 350 the best. What replacement part should I order from your website?

User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting, Milan! If you have a Series 350 channel balance, I recommend looking at our S350-28. Just confirm that the length of your metal channel is 28"!

I would also recommend the 2730 option, based on your stamp. This option can carry a window sash weight range of 13 through 19 pounds. Does your sash's weight fall within that range?

Please keep in mind that the weight range 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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