A total of ten more GTRs were built, with none of the previous cars being upgraded to the 1997-spec. In order to be allowed to construct cars that were so radically different from the F1 road car, McLaren was forced to build production road cars using the GTR '97's bodywork. These cars came to be known as the F1 GT, of which only three were built. The 1997-spec cars are commonly referred to as the "Long Tail" version due to their stretched bodywork, most noticeably at the rear.