Replacement Part Identification

A home owner from virginia says:
November 11, 2020
Good Afternoon,

I need to replace some springs from a few windows.

The above photos are the parts needed.

The one labeled D has a 6 stamped on it. I will need to replace both sides so need two parts.
The one labeled A has an 8 stamped on it. I need 4 of these for two windows.

Can you let me know if you have these parts?

Thanks so very much.
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Casey from SWISCO responded:
November 16, 2020

Hello,

Your pivot shoe looks like a match to our 15-180, which is used with our Series 190 coil springs. Take a look a the S190-640 and S190-840 springs, as well as the list of related items for any other balance parts you may need. Thank you!
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
640 S190 Coil Balance Spring
640 S190 Coil Balance Spring
S190-640
$9.74
840 S190 Coil Balance Spring
840 S190 Coil Balance Spring
S190-840
$11.32
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
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