Like Grigg said, the old 17's are a tube type/multi-piece wheel setup.
FWIW, my '65 C30 came with three piece 17's. Most have been swapped out for tubeless wheels by now, but they are still out there.
Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)
Website I made for my crap:
http://www.66submarine.com 
