Reliant Regal Mark III four-seater three-wheeler differs from the firm's Regal Mark II by a restyled (fibreglass) body which is longer and wider, with a higher waistline and wider doors. It also has rounded front wings with a lower bonnet and an oval grille, and flush streamlined rear wings. Wheelbase is 6 ft 2 in. A Drophead Coupé is also available. The engine is a 747.5-cc 16-bhp side-valve Four.