1976 ugly duster

So why is there soo many more parts (grilles, taillights etc for the 71-73 than later dusters? Ive read they sold pretty well the whe time right?
That’s a good question and I’m not sure of the answer. My guess is that as the gas wars got worse, a lot of them were driven into the ground and ended up crushed or in the boneyards. Not sure why the 70-72 era seems to more prevalent