Demon non-option question

Sometime in spring 71 all the body color wheels stopped, and everything was black after that. This is one of those things thats “known” but documentation of such is a bit obscure. Similar to the radio - the radio IS the option, but most cars had the bottom of the barrel R11 2 1/2 watt Music Master. The factory and dealers both knew that a stripper w no radio was a turn off back then.