No, 19.5 eight lug wheels came on many GM step vans; P-30 chassis. You'll also find 10 lug 19.5's and 8 lug 16" wheels on step vans, so look carefully before you buy just any old step van wheels.

Keep an eye out for single 19.5" 8 lug wheels, also found on step vans and I'm always looking for some.

Some info here
http://www.stovebolt.com/techtips/wheels/

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-