In reply to your question. I have a 1966 Autodynamics D-3. It is powered by a Porsche Super 90 1600, has a Porsche 741 transaxle, Porsche A drum brakes, and 13 inchh wheels using Porsche centers and Corvair outers. Car was built by Autodynamics of Milwaukee, and was one of three as told to me by the owner of AD of Milwaukee. I raced it at Rennsport V. for pictures go to Autodynamics Formula B on Google.