68 Dart tail light harness

I'm not really worried about the side marker lights because I'm using it on my 67 (w/ 68 tail lights), so there aren't any side markers. Right now, the reverse lights are in the bumper and that's about to go away. Want to move them up into the tail lights.

I might just cut and splice the harness that I have. If done right, it should be okay?!? And I wouldn't have to worry about the un-used side marker sockets.