I will be following this post for any updates. I have the same issue. My driver side was missing the stud when I purchased the vehicle. 54 3100. I purchased a replacement handle thinking it would come with the stud. It did not. Now the new handle is sitting in the glove box waiting for me to come up with a solution or give up and purchase a new window (or find a donor) I have considered trying to make my own but have not tried yet. I hate the idea of replacing the entire window just for that missing stud. Good luck. I hope you come up with a solution.

Dave from Northern Kentucky
My 54 3100