Need two replacement window balances

A home owner from Vancouver, Washington says:
I would appreciate your help in identifying the correct parts, so that I do not order the wrong thing!
The metal part of the balance is stamped BSI 2530. It is 26" long and is 1/2" wide.
The shoe wings are 15/16" wide on both the top and bottom. (The shoes are both 1/2" wide not counting the wings.)

In the pictures, you can see the other two dimensions for the bottom. I wasn't exactly sure of the nomenclature!

Do you need any additional information to help me? Thanks.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! These pictures are perfect. I recommend our Series 385 channel balance. This uses the 15-004 shoe, which is 1-3/32". I think yours may have just worn down over time.
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