Fenders from 71-72 Le Sabre/Centurion/Electra are all interchangeable. How much of the Qtrs do you need. You may be able to get enough for patch panels from a Coupe or even a sedan.
Where are you located, I just found a 72 LeSabre at a yard here. I didn't check the condition of the fenders, but they might have been ok. Kimson