Tuff Steering wheel and adapter

Ok so I picked up a Tuff Steering for dirt cheap that came with an adaptor already. The guy said he had it on an E body however the adapter I have is not the 'ribbed' kind that I've been told are correct for E bodies. It looks more like an A body style. The outer part is 3 1/2" and the full length is 4".

Also, how can I tell if this is a real Tuff wheel and not a reproduction? It looks old enough to be one lol. It is 14.5" in diameter. It seems like the grant steering wheels are either 13 or 15"