They were considered very good (according to some better than the original) and could take many different donors for chassis and drive line, like VW Beetle, Saab, DKW, MG, Simca, Porsche, etc.
Lundgren built and sold tuning items and in the mid-1950s he heard about a burned-out Alfa Romeo Giulietta Sprint and got the idea to make his own bodywork for it.