As I recall, that stud has a tee bracket that's riveted to the frame. A guy with a welder could weld a cut off bolt to that tee bracket, and then rivet it back on the frame. [on edit] Here's a couple of pictures.

Or if you post in the Swap Meet, someone may have a rusted up wing window that has a serviceable stud on it. I built my wing windows from two sets, but unfortunately pitched the rusted up ones or I'd send you the part you need.
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IMG_4470.JPG (215.61 KB, 17 downloads)

Last edited by klhansen; 09/02/2025 4:51 AM.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.