You can still buy new 16x6 6lug and 9.75x16.5 8lug wheels. You can find these wheels on trailers as well as ag equipment.
Now 8.25 and 9.75 had 10.00 x 16.5 flotation , In all my info the 12.00x16.5 was never a option. My extra set of kh 9.75 are on STA 10.00x16.5 Super transport tires.
The fire trucks " Brush trucks " GM and ford that had 9.75 used 10.00x16.5 Super Trac ,Destone " sp" and the power kings. They may have used the 12.00x16.5 on brush trucks but as of now that's all the info I have.
See " Brush Fire " thread
http://67-72chevytrucks.com/vboard/s...d.php?t=442259