 Heerey kept developing the car, reaching a third variant by 1971 (referred to as 1-3, for "model 1, variation 3"), when about 170 kits had been manufactured.This third model used the Mini's front bumper (earlier models had none) and the taillights of the Triumph Dolomite.The rear subframe was changed from a sheetmetal to a lighter and easier to manufacture spaceframe design, which also freed up space for the radiator to be fitted next to the engine rather than up front.