Return springs broken, might be from M & W window

A home owner from Greensboro, NC says:
July 9, 2019
I have a window sash that has broken return springs. They aren't many markings on them, but might be M & W?

What are the part numbers for the replacement parts? Where can I buy them?
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Tom from SWISCO responded:
July 16, 2019

Thanks for contacting us! We can definitely supply these balances for you. Looking at your first photo, and starting from the bottom and working my way up, I recommend our 15-180 pivot shoe, Series 190 coil spring, 15-182 bushing, and 15-186 balance clip. I'm very confident that these parts will repair your window. You'll just need the stamp off the old spring to determine the best Series 190 option.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Balance Bushing
Balance Bushing
15-182
$1.80
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
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