Hello, I got rid of the lock ring wheels on my 66 c30 years ago. to do it right takes a little work but its not hard. First find 6 16" budd type rims off of a c30, these were used from the late 70's through 1990, get the plates and lug nuts with them if possible.These rims should clear the drums just fine,but if you have any doubts test fit one of the rears first. You will need all new 9/16 lug bolts long ones for the rear and short ones for the front. disassemble all 4 drums and hubs(good time to clean/check wheel bearings and replace seals) bore the drums and hubs out to accept the 9/16 studs. I did it one sunday afternoon on my dads big drill press with a 17/32 drill bit(you might want to double check on the drill bit size as its been over 10 years and I cant find the actual bit I used). Press in the new studs, reassemble everything and bolt on your new rims. I recommend using 215/85r16 tires as anything wider may rub. You will be amazed at the difference in ride and handling.....Mike
