Bottom sash. Right side. Pivot shoe and coil balance

A quick learner from Philadelphia says:
Hello,
I need replacement parts for pictured item. The only marking I could find were the letter J and the number 6... the piece is 1/2? thick. I am hoping for a complete set (2 top, 2 bottom)

Thanks!
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Thumbnail of the uploaded file named image.jpg
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Paul from SWISCO responded:

Hi there. Start off with taking a look at our 15-175 coil balance shoe. As for your coil balance, are the "J" and the "6" stamping on the same spring? If they happen to be on two different springs, we'd like for you to get the sash weight of the window. If they're in fact on the same spring, I think you will be safe going with our S152-6 coil spring. That appears to look like the closest match we have to your current springs. 

A quick learner from Philadelphia says:
Thanks! The 6 is on the top piece of plastic and the j is on the middle.. no markings on pivot shoe
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Paul from SWISCO responded:

Wait, I'm a little confused. Are these stamps on the spring itself or the plastic? Can you show me a picture?

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