single hung non tilt channel balance is 21 3 FN CALDWELL

A quick learner from rancho santa margarita, ca says:
May 22, 2017
i have an existing single hung non tilt window with a channel balance with one marking of 21 3 FN CALDWELL.
i have no idea of the window manufacturer.
The length is 22" NOT including the top plastic piece.

i believe that i need to replace with a 22" 385 series 2110 option. Please confirm.

Thanks
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
May 26, 2017
Thanks for posting! I would recommend our S385-22 channel balance with a 2130 option.
22" Series 385 Channel Balance
22" Series 385 Channel Balance
S385-22
$9.59
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