[1967 4K]

I have Cragar SS 15x4 round spoke and have two piston disc on the front of my 67. I used a 1/2 inch spacer but could have got by with a 3/8. You have to use extra long shank Mag lug nuts and cut them down to the proper length. I drilled my spacer out to the size of the nut shank did as to let the shank set deeper on the lug bolt. Left about a 1/16 to play on.
We have a machine shop at work and those guys help me figure out all length measurements and it didn’t cost me anything. They used a mill to cut them and used a tap to clean up the threads.
I installed them a torqued them to 100 foot lbs. and they never came loose. Doing it this way you don’t have to change out the lug bolts to longer one like most racers use. I can go back to the stock steel wheel and all is as factory correct.

Richard