Sort of like Corporation Blue on 1970 Superbirds. Was that a 999 special order paint?
I found this on the internet so it must be true!!?!!!????
http://blog.hemmings.com/index.php/tag/nascar/
Hemmings Finds of the Day – Petty Blue Plymouth Road Runners


Mopar fans, feel free to elaborate – we couldn’t find any more information on a raffling of a Petty Blue Plymouth Road Runner in 1971 than what the seller of these two 1971 Plymouth Road Runners was able to provide. According to the seller, Plymouth only built three petty Blue Road Runners that year, and these two for sale on Hemmings.com are No. 2 and No. 3, both 383 cars and both in need of restoration. They differ slightly in their specifications: The No. 2 car has black interior, an automatic transmission and a vinyl top, while the No. 3 car has blue interior, a manual transmission, and tank tread graphics.
It would make sense that Plymouth publicize their link to Petty in 1971. That was, after all, the year that Petty drove a Hemi-powered Road Runner in NASCAR, winning the Daytona 500 and 20 other races to take the Winston Championship and earning more than $1 million.
So if these are No. 2 and No. 3, then can we presume King Richard still has No. 1? Or is No. 1 yet another contest car that is yet to be found?