Tilt window housing pivot

A quick learner from Yardley, PA says:
I am pretty sure a 15-087 housing will work for me, but I'm not sure about what coil spring to use. The old one has "527X" etched on it. What would be the correct replacement?

Thank You,

Art
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Paul from SWISCO responded:
Hmmm... I'm not familiar with that stamp. My first thought is our S152-5, but I'm not sure. Could you show me a picture of your current balances? Can you also tell me how heavy your sash is?
A quick learner from Yardley, PA says:
Attached is a photo of the housing pivot& bracket. The housing measures 1-1/4" w x 1/2" thk x 2-1/4" h. I don't know how much the sash weighs.

To me, it looks like your 15-087 housing pivot?
I've been told that the window is possibly a Silverline?

Thank You,
User submitted a photo of a pivot shoe.
A quick learner from Yardley, PA says:
Paul,

I've tried to send a photo of the balance, but not sure if it transmitted correctly?

Art
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Paul from SWISCO responded:
Art, your photo came through. We are reviewing it now and will get back to you shortly thank you!
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