Hmmmm...I saw no nomenclature that required "production" as the criteria for the " what's the rarest Mopar wheel"...IMHO "55" units would denote "production" if that's YOUR requirement?,... wasn't "50 units" the NHRA's minimum requirement to allow the 68 SS Hurst cars to be considered "production units"?... IIRC "50 units" is considered the absolute minimum in the automotive production world to be rendered a "production unit"(ie: BTM Cheetah among many others)?...