Suggestions about repairing rear fenders

[Route-66]

I'm still assessing all of the work that I'm going to need to do to the '72 SWB Fleetside truck I picked up a couple of days ago.

One of the repairs I will need to make is to to the back of both rear fenders (the taillight sections). The fenders have obviously been dented in the past and it looks like that Ray Charles did the repairs on them! I have tried to find rear fender patch panels that can be cut off and welded but with no success. I did find those patches for Suburban's and Panel Trucks (See photo) but no luck with for my Fleetside. It will be a pain to try and straighten everything but it may be my only option unless I could find some damaged fenders that still have the taillight sections intact and cut them out.

Any suggestions? Thanks ahead of time.