Double Hung Window Pivot Shoe

A quick learner from Indiana says:
I have a Double Hung Window with pivot shoes that need replaced. I believe it is a Owen Corning Window, but I am not completely positive. Here are the measurements:

1/2" Thick
1 1/4" Wide
2 1/4" Long (if you measure from the TOP to the curved hump on the bottom)
2 1/8" Long (if you do not measure to the bottom center curved hump)

Thank you for your assistance with this issue.
User submitted photos of a pivot shoe.
Profile picture of Paul
Paul from SWISCO responded:
Please see our 15-046 pivot shoe. Yours has been discontinued, but I personally believe our 15-046 is a better made replacement.
A quick learner says:
Thank you for responding quickly to my question. I have ordered (4) 15-046 pivot shoes and I am going to try to fix my own windows. How do I tell if my old spiral balances are still good? You had suggested for me to use Series 600 spiral balances. My (12) windows were manufactured by Owen Corning before 1997. Is there a certain test that I can perform to see if they are good?
Profile picture of Tom
Tom from SWISCO responded:
There's not really any test, no. If your windows stay up when you lift them, then there's no reason to replace the balances. If they droop a little, you can always try winding them a couple times to regain tension. See the guide below to see how.
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