you are right Rhino.
we only replaced the last two feet or so of the rail, instead of the whole rail.
the rear part around where the rear spring hanger was bad, so not having a dart sport to get the complete rail, we used the rear part of [i think] a valiant, as those sections matched what we needed.
a little finagling around the bumper mounting cross member was required, but nothing serious anyone will see if they crawl under for a look.