Looking at your avatar reminded me of my 1966 427/390 maroon convertible, 4 speed black interior with removable hard top and side exhausts. Wish I never got rid of it - that was a very big mistake. To answer your question, I had the original knock off wheels along with a set of steel wheels and hub caps that I changed for winter driving with snow tires. I had no problem with mounting them, balancing them, or removing them from the car. I used the lead hammer (still have it somewhere in the garage) to tighten or remove the spinners. I was always concerned that I might hit the side of the car when swinging the hammer, but I never did. The previous post is correct, they are extremely difficult to clean, and to keep clean, and you really should use stick on weights behind the wheel for appearance sake. All that said and done, I really liked them. The adapters fit over the lug nut bolts and I had no problems with the wheels at all. I did add a light oil on the spinner threads to keep them lubricated so they would not seize. Of course, when I first got them, I was checking the spinner to make