That is a '71 fender. Back in the mid 80's I bought two fenders from the dealer for my 70 Challenger, and mine look like that also, with the cutouts. From what I have found out from the part numbers, these were supposed to be used on the 1971 Challenger T/A.
My headlamp buckets were also way out of place and I had to drill out the welds and re-position them, I am so glad I test fitted the grill early on. Sorry, I don't see any pictures I took while doing it.