Need Tuff Wheel/Rimbow Adaptor

Here is one that I have. The one on the right is the one I will sell to you. Notice that it looks different than the one on the left. I do not know what it came off but was told when I bought it years ago that it was for an a-body. It does not have a grounding wire or correct nuts. If anyone can comment on the difference in the pictures please educate me.