Looking for this window part

A landlord from wisconsin says:
October 12, 2016
Hello,
I have windows that need this part. There are no markings at all. What is it, and do you sell it?

Thanks!
Dave
Coil and shoe
Profile picture of Paul
Paul from SWISCO responded:
October 17, 2016
Thanks for posting, Dave. Please see our 15-177 pivot shoe and Series 152 coil spring. This hardware appears to closely match your own.
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
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