I have seen both Argent and Black Bubble in 1970 on E Bodies and Red ones on Cudas up to about Jan 1st 1970. My Nov.5 1970 1971 Cuda came with a Black Bubble, my June built 1971 Challenger came with an Argent Bubble. I believe that Chrysler or I should saw Fram shipped back Argent bubbles that were to be used on 1970 Challengers but were never used in 1970 because of the Hood screw up at the end of production year in 1971. I have seen both Argent and Black Bubbles on 1971 Challengers.. I believe Chrysler was trying to get rid of a lot of old stock. I also have seen that most 1971 Cudas built in April of 1971 have a 1970 Shaker Hood on them. Theory is Chrysler was trying to use up old stock again and used old stock in plant to get rid of it.