After I installed my twin stick and NV3550 I wanted matching shift knobs with a touch "period-correctness". I ordered a 1-7/8" for the tranny and 1-5/8" for the transfer case shifters from this company:
http://www.epcomfg.com/shiftknobs-engraved-8ball-pushbutton.html#engraved
I was able to get the correct pattern for the tranny, but not for the transfer case. I found a local trophy/engraving shop that regularly engraves billiard balls and could easily engrave the proper L-N-H/FRONT/REAR pattern for the transfer case shift knobs using the same typeface as the tranny knob.
I really like the quality of these knobs, they're not plastic, have no seams and are truly engraved, not screen printed. I replaced the WH twin stick knobs and found that over time the rubber finish attracts dirt and grease and the stick-on pattern thingy stops looking so great.
I'll post some pictures later today.