1970 tail lights

Just bought myself my dream car!!! But it is complicated though, so i might need some advice. I think i know what most of you think about originality, i want the same. Mine is a 1970 dodge challenger, but in a strange way, the previous owner replaced the 1970 tail light with the one from 1971. My goal is to put it back in original shape. Does anyone know how to do this? i have never worked on this kind of problem before, so i do not want to mess up! The other thing is, i bought this car through a friend, so i only saw it through a series of pictures. As i was looking for this car for many, many months, I was so anxious I just had to have it. I think some of you will understand . So if you can help me, pleas do. Thanks!!
Author: oskar