Balance identification

A quick learner from USA says:
I'm looking to replace several broken Weather Shield balances. They recommended you as they no longer maintain an inventory of older parts.

The Weather Shield part # are as follows:

PT# - 979041 double hung balance 24-30 6000

PT# - 979043 double hung balance 28-30 6000

Per your instructions, I've measured the balances-
channel width - 1/2 in.
length - 25 in and 29 in
stamp option - 2430F and 2830F

I would say that the series 350 with top 19-002 and shoe 15-004 are the best replacements for the original balances. Would you please confirm or recommend an alternative?

Thank you,
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Tom from SWISCO responded:
I'm afraid I cannot confirm what Series balance you have. Assuming the nylon attachments are the same size and style as the 19-002 and 15-004, respectively, then that will be your best bet.
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