Something odd, screwy, hiccup happened when the '71 "PILOT" & "PROMO" cars were spec'd out & eventually VIN'd (the VINs are all over the place). OPTIONS on tag that aren't there and vice-versa. The well known "curious yellow" 440+6 "PROMO" 'Cudas also have "issues" - most do NOT have N96 - "SHAKER hood" on the fender tag.

The above car M00126 has FJ6/V1W/H5XX/V6J on the b'cast sheet. The '71 Challenger "PROMO" cars also seem to be one offs, not 10+ of the same car, unlike most other known "PROMOs".

Here's the "wildest" '71 Challenger "PROMO" car I know of.