The N96 shaker was supposed to be standard with the Hemi on Challengers as well, but tooling problems kept that from happening. The shaker was clearly shown in the first '70 brochure, but it was obviously a prototype since the grilles were molded as part of the bubble. From what I've gathered, the production issues were due to the greater "draw" needed for the contours of the more-complex Challenger hood stamping. A friend that worked in the local dealership at the time told me the hood panels were even hard to get through the parts system as replacements. A similar situation arose with the original Viper hoods 20+ years later. We waited over a year for one after a deer/Viper collision; they just couldn't seem to get them out of the molds without damaging them.
The same Challenger brochure also shows the pre-production Rallye cluster, by the way. The tach's scale has a "standard" (8-4 o'clock) rotation and a dark-orange "warning track" rather than the lighter production yellow, and the clock has very short second hand. The clock's set knob protrudes through the lens '72-'74 style and is black, even though there's a hole in the woodgrain for it.