broken coils

A home owner from Chicago says:
Two coils; one stamped 7M, the other 4. Width measures 15/32". Need 2 sets for left and right. May get 2 more for another balky window of the same make. No mfr listed. Shoe is reinstalled for now.
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Paul from SWISCO responded:

Greetings. If your pivot shoe and coil spring housing is not broken, you can probably reuse them with our Series 160, 1/2" wide coil springs. For the 7M, you can use S160-7 and for the 4, you can use S160-4. Instead of hooking both coil springs to the pivot shoe, you would hook the top coil spring to the lower coil spring in the rectangle hole and the lower spring to the pivot shoe.

A home owner from Chicago says:
Thank you, Paul.
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