I dunno who made the wheels but the model was "Challenger" and were sold by AR Ricambi a while back. I was going to get Panasport's but they were blowing these rims out at the time for $95 each. I bought the very last set they had. I just removed the side markers, the bertone badge is onlt on the passenger side. I threw Koni shocks on it as well as new Shankle springs which were cut to my liking. I just got another burgundy 74 which I will be making nicer than that. We stripped that car down to the shell and had it sand blasted. Next up is paint. I am going to do it the same except for I will throw twin Weber's on it and 14x7 Panasports.
The wheels are by Performance Alloy Wheels in Oz. Try http://www.performancewheels.com.au/. They weigh about 14 lb and have an offset of about 23 mm. They don't fit very well over the lip on the rear wheel hubs of the 105/115 cars so they have to be machined a bit. Maybe Ricambi did this before they sold them to Alfa owners. I have heard that the alloy used is a bit soft and that they bend easily. Still, it's a nice looking wheel. I have a set but without caps but I have been unable to find a current US distributer and I get no response from Performance Wheels when I e-mail them.