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Ruf uses spacers with their narrow body offset wheels when they do a widebody car; and include spacers when they sell their wheels to a widebody owner (like me )
.....and, i hear their cars go pretty fast
Spacers have also been used by Porsche and are still used. For instance, the Carrera S with 17" wheels came with 31 mm rear spacers from the factory. The 996 gets rear spacers if you order the Sport Techno wheels from the factory. A good quality spacer, if used properly, should be no problem.