SIE was a manufacturer based in Chicago, Illinois, that offered a kit car called the Triad from 1975 to 1976. The company drew on experience gained from building custom motorcycles, with Steve Iorio developing a fiberglass car kit styled to resemble the Datsun 280Z, though with a lower, wider, and more angular appearance. The Triad's body was mounted on a Volkswagen Beetle floorpan that had been shortened by about 10…