hmm I just tried to reply and it didn't work. oh well I'll try again
I recently put in one of these lower rear quarter panel patch pieces on the drivers side of my 67 coupe. Got the part from Classic. Here's a few pictures so you can see how much it wraps around. The patch does create the corner but the tail panel extends almost all the way to that corner. If the tail panel is only screwed up right near that corner then maybe you can bend up your own patch for that.