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Body color bumpers were optional on B and E bodies at various times, but I don't know that they were ever offered on A bodies?

1971 A- B- & E-Body Mopar Options & Accessories - Mopar Muscle Magazine
No painted bumpers on A-bodies! And the few E-bodies that had them were "elastomeric" which was a pretty cool option, quite futuristic actually, as virtually everything on the road nowadays is some sort of plastic.