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The inserted washer in the curl is the foolproof test as some original bumpers did not have the enlarged middle knuckle on the end. Original hubcaps have a cadmium-plated base and the reproduction bases are zinc plated. There have been numerous versions of the caps and some are well made while others are mediocre at best. Even the best of reproduction caps, regardless of whether the caps are B or V-8, differ from an original in the shape of the center portion (the oval on a B cap or the V-8), but that's hard to perceive short of a side by side comparison.