They look cool, but a big warning. I think your feet will not feel comfortable and may very easily slip out of these ones. So, use good judgment…or use these inserts on stock early Harley floorboards only when exhibiting your sled in a bike show.
You can also use them alone if you make your own custom support brackets.
They are 1/4″ thick and the skull is raised. Sold as pair….at your own risk. Limited quantity. At Infernal Combustion Design.