I wouldn't be surprised if you could manage to make one though, by swapping the balls (and pressing/gluing a white one onto a standard shaft), if you couldn't find an actual original white shaft/knob.
I can take measurements later. It has a slight hairline crack at the bottom, but it's NOS as I got it from a distributor years ago. You can compare the size to the keyboard keys to get an idea.
I can take measurements later. It has a slight hairline crack at the bottom, but it's NOS as I got it from a distributor years ago. You can compare the size to the keyboard keys to get an idea.