First off, the price is $39.42 for the kit, at a local dealer here. I know because I broke one of the bolts that holds the FPR cap on. They will only sell the kit not just the bolts.
Second, I figured since I already have a set of o-rings on hand, so, since it's off I might as well use a new one if it will hold up to the diesel fuel. But since I've been told otherwise the original will go back in.