Quick tilt single coil window balances

A home owner from USA says:
Hi. I spoke with you earlier today about buying two quick tilt single coil window balances and two shoes. The window sash measures 29"in length, 26 ½" in width and weighs 20 pounds. I cannot find any markings on the current balancer but the coil number is faded but it looks like #10.0-35. We tried taking pictures of this number but it doesn't show in the picture. I am sending several pictures of the balancer with measurements, a picture of the current shoe inside the window track with measurement and a picture of the general window overall. I am looking to replace both shoes and both balancers with parts that will work with my window. Thank you so much for your time and trouble.
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Tom from SWISCO responded:

Thanks again for your patience! It took some digging, but we think we were finally able to track this down. Please give us a little more time to have stock made up for you and we will let you know as soon as it's available in our catalog!

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Tom from SWISCO responded:

Okay, we finally have it all ready for you. Please see our new 15-251 inverted universal single support. I think you'll find this is a great match for your old hardware.

Now, this is just the support. It looks like you might need a new coil spring, too. We recommend our S160-10. I think this can work well for you.

A home owner from USA says:
Do I need to buy a new shoe as well?
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Tom from SWISCO responded:

The 15-251 acts as the shoe itself. Were you referring to something else? If so, can you show me a photo of it?

A home owner from USA says:
Hi Tom. The picture of the shoe is the last photo. It is still in the window frame. I can't get it out. I can use it but since we were replacing the other parts I wanted to replace it too.Do you think it will work with the new parts? Thanks so much.
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Tom from SWISCO responded:

Ah, I see. There's a good chance you can reuse that bracket if it's not broken. Believe me when I say that the 15-251 is one of a kind. If it is broken, though, show us a picture of it removed and give us its dimensions and we will do our best to find a good match.

A home owner from USA says:
Thanks Tom. We will try it with the old bracket. If it does not work we will get back to you.
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Tom from SWISCO responded:

Awesome, thank you. Please do, we're more than happy to look into it if it doesn't work.

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