What determined Shaker bubble color?

[Grec]

I'm seriously considering doing a Shaker setup on my 73 Challenger at some point.

The theme of the car is building a Six Pack 73 that looks like what Chrysler would have built had emissions not neutered the E Body after 71. Plan would be to find a flat 73 hood and convert it. That way it would have the DODGE lettering, which flat-hooded Challengers had by this point. Works out well as I never cared for the tri-star emblem on 70-71s. :-)

As to the bubble, I've seen three different paint schemes: Body color, Organasol black and Argent Silver. My question is, what determined bubble color?

From what I can tell, the body-colored bubbles (which I've only seen in red) all happened in 70. After that, I've seen both black and silver on 70s and 71s.

What's the deal? Was it optional... or determined by car's color scheme? There doesn't seem to be any real pattern.

[Topcat]

Only the FE5 cars were intended to have the body color bubble. Flag ship color and all (at least for the early advertisments).
Other exterior colors for 1970 had the Argent bubble. Sometime late in the 1970 model year (~Late May or June), the Argent was replaced with the Black bubbles.
There are many original cars and documents that have exceptions.
Late 1970 with Red bubbles, late 1970 with Argent bubbles, early 1971 cars with Argent bubbles, etc.
But those topics have been discussed here before.

http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=6779076&an=&page=&vc=1

[Grec]

Good info. Thanks, guys