10 inch balance spring

A home owner from California says:
The metal part is 9/16" x 5/8" x 10" long
User submitted image of their window hardware.
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Paul from SWISCO responded:
This balance will have to be custom made due to its especially short length. That shouldn't be an issue, but before we go any further I would like you to confirm the size of your bottom shoe. It could either be our 15-004 or 15-005, but since yours is broken I'm not sure which. You can use an undamaged balance for reference.

Please also tell me how many you will need.
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