A Lotus 57 (for Formula 1) and Lotus 58 (For Formula 2) was built around the same monocoque chassis. The car was initally run as the Type 58 car, with a Ford FVA and tested by Graham Hill. However, with a lack of enthusiasm for F2 with in Lotus, the project was dropped. Later in the year, the Chassis was completely rebuilt as a Prototype F1 car, confusingly designated a lower number, Type 57. The car was fitted with a 2.5 litre Ford DFW engine. The Prototype was never developed.