opinion on 70 charger with factory wing

[442w30]

That Charger should have a white stripe.

If you go to THIS site, you'll see that option J81 is the rear spoiler. They made approximately 197 Charger R/Ts with this option . . . but it's for US-spec cars only and doesn't include total production.

Since your friend and his "experts" seem to be open to misinformation, here's another thing for them to think about: You cannot combine production figures. In other words, if his car is purple, he can't figure out the purple number and then figure out how many of those purple cars came with the spoiler.