Mark, Picture of my problem is here (not the knob.)
http://www.talkmorgan.com/ubbthreads.php/topics/361737/Shifter_Ball#Post361737 Unfortunately I don't have any pictures or engineering drawings of this transmission so I can't help with part numbers. I had to go to
www.davebean.com/ in California to find a replacement. They may be able to help.
Cheers,