Not so rare to find 72 parts in my 71: my car has been in two severe typically car-killing smash-ups and several lesser fender-benders over the years. I have replaced lots of stuff with bone-yard parts ( sometimes from 72s, sometimes even 73).
If I had known how valuable these cars would end up being today, I would have taken better care of it over the years.
72 doghouse, a 73 door, 72 dash panels, 73 console, 73 upper dash, chinese quarters, trunk floor, back panel and valance panels, repro spoilers, home-made ram-air base ( original stolen by tow company after accident), repro Magnums, etc...
If my car was low mileage and all original, I think it would probably be worth twice what it is now, if not more.
But, even though its a 350,000 mile mongrel, it looks and drives great and I love it. Its a keeper.