pivot shoe for old aluminum tilt window

Hi folks at Swisco--

We have old aluminum tilt windows with no company name but "1977" stamped on the metal. We purchased a spiral balance charging tool from you, and tried to tighten up a window with it (top half slides right down). Of course, the pivot shoe broke. So, we are need of replacement shoes, but the best I can do for measuring is 17/32" (or 9/16") deep, 1 1/4" wide and 2" or (2 1/8") high.

These pics are not very good, but perhaps you can suss something out of them.

Also, will I need to order spreaders in order to replace shoes in an aluminum track?

Thanks for your help,

Mic

Thank you, Paul, for your response. There were indeed cutouts at tops and bottoms of the frames (didn't know those were there!). So we were able to easily remove an intact pivot shoe to double check measurement (1 1/4" x 2" x 17/32"). (Attached is a photo.)

I've placed an order for 15-015 shoes. Since we have old and deteriorating windows (as you see), should I order spiral balances as well, assuming they'll be the next thing to go? In which case, which ones should I order?

Thanks again, Paul. You've been a great help.

Mic

I have some old aluminum Thermal windows. They have some unusual looking balance shoes that I need and balancers. I'll send a few pictures. The balance shoe in the picture is missing the top half. Thanks