Bottom sash. Right side. Pivot shoe and coil balance

A quick learner from Philadelphia says:
May 14, 2018
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:
May 18, 2018

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:
May 18, 2018
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:
May 21, 2018

Wait, I'm a little confused. Are these stamps on the spring itself or the plastic? Can you show me a picture?
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
1/2" Coil Double Support
1/2" Coil Double Support
15-150D
$1.57
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