The cars came without a radio (although the speakers were installed and the car pre-wired for the radio), air conditioning, leather seats, tool kit or a sunroof. The doors have aluminum skins. There is no underbonnet insulation blanket and the trunk only has carpet on the floor. The under body insulation is thinner and there is special carpeting to lower weight.
I can make my own "Lightweight". Just rip out half of the interior, radio, aircon and everything else. And you get bloody special edition worth twice the price.