Hey Ed,
If youre interested in a 'fully stainless steel' chrome gear knob with no design on it i can make one.
I doubt you will find one like this as its home made, unless you have contacts in the metal industry.
I have one for my 33 and am very happy with it as it wont fade, feels very firm and looks slick..
I can send you some pics today week when i get back home on my pc as im in europe at the moment.
-Personally i like the shape of the nismo one but the look of g-rex gear knobs.
Cheers
-Serge