Quote: Obviously the "brass" wanted the Challenger to be all things to all people, and they were successful selling 83,000+ units in the first model year.
.... but late introduction of the "A66" package (what exactly was the package?) looks to have confused the line workers as much as it is confusing us. I'm sure the early 340 Challengers caused all types of havoc on the assembly line. The instructions for the "body-in-white" (fender tag) has JH "OOOPS" no R/T hood. The "A66" cars were the first Challengers to be wheel-lip mouldingless, here comes a Challenger "OOOPS" it has wheel-lip mouldings now. What's the next car in line its got a big white stripe, throw this black grill in it, "OOOPS"!
I think this is the best explination yet for the differences in the early A66 cars. Mike
its got a big white stripe, throw this black grill in it, "OOOPS"! 
