I've got a set of brand new never installed front Mopar Molded Splash Guards for the 99. These fit the Durango or Dakota "with flares". I had bought the complete set F/R but never installed the fronts due to installing molded running boards. If this is something you may be interested in, I can post a picture. You'd need the rears though to complete your set. Could probably do $20 shipped USPS.
I also have a K&N FIPK for the 5.9 Durango. The tube is brand new never installed, (updated version) the rest of the kit is slightly used but like brand new. I know it is not on your list but thought I would throw it out there. I'd do the splash guards and the kit for $100 shipped. Can get pics for this as well.