The COB/COX chassis were numbered 6101 through 6132. We were fortunate enough to have two of the original eight COX Cobras on the 2007 Cobra Moonshine Tour in North Carolina this past May, COX 6111 and COX 6126. There are indeed differences in the gas caps on the two cars. I feel sure Ned will comment on his car being Frenchy-fied. It was originally in Switzerland, perhaps the French region, and possibly caught something from the French gas that made his gas cap retreat? Just a thought.