Balance for a 48 x 72 Milgard Window

A home owner from Oregon says:
We need to find two window balances for a 48 x 72 Milgard Window.

The balances measure 23 11/16 metal edge to metal edge, although since the number on the balance reads 23 5 I wonder if that's closer to 23.5 inches?

There are no other markings on the balance.

User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
We should be able to help. This is a special kind of balance that will have to be custom made. Before we begin, can you show me a picture of the top nylon attachment? Can you also show us a clearer picture of the metal clip at the end of the cord? Thanks!
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