Throttle linkage replacement

[JHZR2]

What’s the latest on throttle linkage replacement?

I noticed this cracked ball end today. I know I’ve read that folks have pulled all metal ones from 616/617 cars to swap the plastic ends. But do the plastic ends still exist?

Are they all set up with right and left handed threads in opposing ends?

Are the threads and ball sizes on all of these the same?

EPC isn’t very helpful. It shows a bunch, most without part numbers and not enough detail…

Thanks!