Window Balance Replacement Part 86 caldwell 27-4

A handy person from Carlsbad, CA says:
I am trying to find the replacement balance for an aluminum window. It appears to be a series 86 caldwell 27-4 (27") 1/2" channel. I am trying to see if any of your balances would work. Something in the 350 series looks really similar. I've attached images to see if this helps.

I appreciate your help.

User submitted photo of channel balance attachments.
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Mike from SWISCO responded:
With the stamp 27-4, the metal channel should measure 28" (not 27" as stated in your initial query). Please recheck that measurement.

It looks like you have the 19-005 top and the 15-004 shoe. You need to order our S385-28 with the option of 2740.
A quick learner from california says:
how many metal channel balance do I need per window? my tenant remove the window and I don't know how many were in there?

thank you
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Ben from SWISCO responded:
Each moving sash requires two channel balances. Two sashes means four balances.
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