I wanted to run the wider MBS tires on my Z3 so had to make drive adapters. I’m not a machinist but a friend is, retired, and he has some older lathes and a mill so he let me use them and gave me suggestions on how to do it. Huge pain the ass to recreate the drive pattern, at least for me, but I got it done.
Original Z3 drive coupler pattern I needed to copy: