Certain Teed Coil Spring 336 SK

A home owner from waukesha,wisconsin says:
where can I get a replacement coil spring for a CertainTeed Window. Spring has " 336 SK " stamped on it. Any help you can give me would be appreciated. Thanks
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Paul from SWISCO responded:
Thanks for posting! Check out our S170-336. This is a CertainTeed coil spring with 336 stamped on it. How does it compare?
SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
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