Jellybean or Kidney.......... the first ones I know of were made by ET mag wheels in the 60's, called a ET 5 slot mag, many others have copied them, the first ones were made to fit a single bolt pattern, the latter was called vari-fit I believe which came with the appropriate washer for your app, had to made sure these did'nt run loose, good luck on your hunt, they are getting rare, I have a chevy set but not for sale.