Replacement spiral balance shoes

A home owner from Albuquerque, NM says:
My home was built in 1990, and contains Weather Shield wood double-hung tilt windows. Several of the (upper) balance shoes have become brittle and broken (they are metal). Is there a suitable functional replacement part for these, as I expect they are no longer manufactured in their current form? Marking on the balances is "24TG". Appreciate any help you can provide.

User submitted picture of 24TG channel balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, Dean. Before I can offer an applicable substitute for your balance, could you first confirm the length of the metal channel portion of your balance? Thank you.
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