Seeing as I can't find a set of quarters for a '73-'74 Road Runner, I am wondering what the difference is between those and a '71-'72?

If there is not much difference, I would be open to getting a new set for a '72 and cutting out what's different and adding that from the '73 assuming the '73 parts are still OK. I mostly need wheel arches and lower quarter replaced, but would prefer working with a full quarter.

Same goes for the trunk drop downs.