Thanks Golf-Cart,
I didn't machine the knobs myself... (I'd love to be able to do that kind of stuff though...)
Got the one for the 4WD selector at CT ($ 14.99) and the other one for the tranny-shifter with the release /lock button built in, I picked up somewhere years back (initially intended for my then "fun-ride" 1971 Chevy Impala Custom Coupe - but never used on that machine) - but I can't remember where I got it (probably also CT or maybe Lordco or something?...)...
CT has a whole selection of various different type shifter knobs in their "locked up section..." - pretty much something for every taste...
I actually took my new 4WD selector knob to Vancouver Engravers so that they can engrave the shift pattern... the other day I suddenly wasn't sure if I had it in 4WD when just staring down at the lever (can you believe that?

...) while cruising on dry pavement... of course it wasn't - but it's these moments where you sometimes just doubt yourself....
And if somebody else were to drive the Van (my wife for example) I would want them to know where to shift to get 2H, 4H, 4L etc.
Cheers,
Chris