Side channel balance for bathroom window

A home owner from Hayward California says:
Only number on part 19 4 B.S.I. PM
Please see photo attached
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Bob from SWISCO responded:

Thanks for writing in. We can replace this balance for you, but it has to be via custom order since it doesn't match any of our stock items. Can you show me a clearer picture of the metal clip that comes out of the bottom nylon shoe. It might resemble our 62-108 or 62-106, for instance. From there we'll do our best to ID what you need. Many thanks. 

A home owner from Hayward California says:
It does look like 62-108. There really isn't a point to them
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Bob from SWISCO responded:

Thanks for getting back to me. I just sent you an email with a custom link enclosed to order a pair of these balances stamped 19-4. I agree your balance's old hook resembles the 62-108, but I advise always checking another to be absolutely certain. Let me know if you have any questions prior to placing your order.

Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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