The original dash knobs.
I measured each of them for threading.
These are "Black Chrome" knobs I found that actually are made to go on kitchen cabinet doors. I thought they were cool and decided to find a way to make them fit on each of my dash knobs.
On some of the shafts, grinding 
was necessary to get the shaft to
the right circumference......
Then I put them in a vise and 
re-threaded to the right thread 
size & pattern of the existing knob....
it worked quite well. Then, for 
these, I just screw the knob on
the existing Jeep hardware.
   
Other knobs had a small set screw 
the screwed in the side of the knob. 
I re-drilled the knob to the
correct size of the shaft........
..and cut a notch in the side of the knob... 
drilled a hole for the set screw...
tapped the hole for the correct threads...
and screwed the new set screw in.
The finished product for the dash.