Someone hit & run the same parts on my 2000 4RNR during the DAY on New Years. Reported to the police and I'm paying about $150 total for both aftermarket 2002 (upgrade) tail lights and an aftermarket bumper extension. In 3rd gens there was a change in the lens style. Not so in the 4th. I always get both lights in case there is a slight fading of the old ones. Try looking through eBay. I'm not a fan of tinted lights. The only 4th gen tail light "upgrade" I could find is ugly IMO.
Northwest Trail Innovations will have a rear bumper kit for 4th gens. We're shooting for the next few months for release if you're interested in a diy weld together kit..