spiral balance part

A quick learner from Cincinnati OH says:
Hello! I am repairing 60 year old aluminum windows and need 4 new spiral balance shoes. The bottom sash clips seem to be okay. I don't see anything here that come close to this design so hoping you can help me out. Many thanks!
Thumbnail of the uploaded file named discontinued spiral balance shoe
Thumbnail of the uploaded file named discontinued spiral balance shoe
Thumbnail of the uploaded file named discontinued spiral balance shoe
Thumbnail of the uploaded file named discontinued spiral balance shoe
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Paul from SWISCO responded:

Thanks for reaching out to us. The shoe shown here used to be something we sold but it was discontinued. The closest we can offer is the 15-040N though we can't promise they will work for you. The total length is 1-3/8", and the body is 1" and 3/8" wide. The back wing is 5/8" wide by 1-3/16" tall. Have a look and see what you think. 

Alternate image for 15-040N
Alternate image for 15-040N

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