So as far as I can tell, the G36 option for color keyed mirrors plus the BS Cuda designation allowed for the colored keyed grill in certain colors. Orange Blue Red and Yellow being the most common. I have a late built 72 07/10/72 that is fender tagged G36 and has the color keyed mirrors and grille (pictured above in another post.) Have not pulled the broadcast sheet, but it is not a V21 car, nor does it have stripes or vinyl top.