There were issues on the one that I did. First of all, the replacement was Euro-spec, so it needed some bracketry removed with a plasma torch. Secondly, the frame rail extensions travel up far enough that they interfere with the NAS fuel tank mounting brackets. I ended up having replacement brackets fabricated, which increased the cost. After all that, you need to carefully cut the old brackets off, and weld the new ones in place. Oh, and guaranteed, you will break most all of the bolts when trying to remove the rusty fuel tank skid, rear bumper, and just about everything else.
Umm.... Have fun!
Ooo... almost forgot. You need to consider the fact that the rear harness will interfere with the extension on the passengers side as well.