Looking for correct Pivot Shoe

A quick learner from philadelphia says:
I don't know the name of the window company. Looking for some expertise helping locate the proper pivot shoe. The depth of the window channel is 1/2". The pics show the measurements for the other sizes.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Looks like you have an early aluminum replacement tilt window. I recommend our 15-015 new style pivot shoe, which is made for aluminum replacement windows. Just confirm that our measurements match yours.
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