Mounting a steering wheel
 

I'm looking to update my steering wheel with a Grant model 457.. I currently have a 6 bolt Dino wheel from the late 90s. I was hoping to find something to bolt to my existing hub. The picture of the Grant wheel shows a 6 bolt pattern, but I was wondering if this is just a decorative cap, or the actual mounting point.. Maybe somebody here has worked with these or other Grant wheels? Thanks----Rob