Changing the rear quarters on my Dart conv. from a 69 to a 70

You will need to graft the tail section from a 70 or 71 Dart due to the trunk opening being revised from 69, as well as the bumper attachment points. I knew one person who did it with a 68 as a starting point 20 or more years ago, but I only saw it after the rear section was grafted on. There is also a member on this site who lives here in Alberta that has a very nice example, complete with a 426 Hemi and a shaker hood. Have never seen it in person and I don't recall his screen name. Sorry, I know that's not much help.
I have the quarters, the rear panel, the bumper bracket supports (the trunk pan is the same from 67-72) ,the rear panel and the trunk lid, bumper and brackets, so all I need as far as information is I would like an idea as to where would be a good spot to add the 70 1/4 panel to the 69 1/4 panel. I can figure it out but I was hoping for pictures to make my decision easier. The 1/4's on the car are in good shape so I really don't need to do the full quarter only the transition area from 69 to 70 at the very end of the quarter where the 69 to 70 change begins.