starkweatherr are you going to use the 19.5 wheels on your 73 C30? If so I have a set of six 19.5 wheels from a 1972 C30. The shipping to your location would be pretty high, but it is an option.
Here is a note to others who are trying to use 19.5 wheels on big bolt trucks. You need to measure the brake backing plate or drums outside diameter. If either one is greater than 16" the 19.5 wheels won't work.
