I cut too much off, now I'm in trouble

I have a 70 Coupe that I am replacing the tail light panel on and I was in the process of drilling spot welds and noticed that the drivers side upper trunk corner was rusted pretty bad and I had remebered seeing them in my cateloge for sale. So I proceeded to cut it out along with the old tail light panel. Well afterwards I went to the cateloge to order a new one and noticed that they are only available for the 66-68 coupes and they have a different one for the 69-70 fastbacks.
I am so pissed at myself right now. Is there any hope for me? Is the junk yard my only option at this point?
Thanks.

Dave