Tuff Wheel

I recently bought a grant repop Tuff wheel for my 72 Demon, along with the horn kit. It looks like I need a spacer of some type also to make up for the shallow dish on the tuff wheel. Do I need one, and if so, where do I get it?

Could someone please post a photo of a tuff wheel in an a body? From the side so I can see the spacing.

Thanks!