Is an 8/72 car a 72 or 73? The car in question has 73 bumper guards and 73 side stripes. I always thought the color keyed grill was a 71-72 thing. Just because the brochure shows it doesn't mean it was available during production.
Good point - looking further I wonder if the color keyed grille was first intended to continue on for 73 but then killed off. Maybe a few snuck out early? The info for 72 can be found on Hamtramck-Historical but I don't see anything similar for 73. For 72 it looks like it was standard with certain paint colors.
https://hamtramck-historical.com/images/dealerships/1972PlymouthOrderingInfo/1972_page_61.jpgI've got a copy of the 73 coding guide, and there is no mention of a color-keyed grill.
