I can see why it's confusing! So, when I look up the bound bumper for a 97 Pathfinder, I come up with 55240-0W010, which is the gray bumper; this lists as being "to 12/98, from 12/98." The yellow bound bumper is the 55240-AD010 (supersedes 55240-5V010), which lists as being for "from 12/98." Of interest, I noticed the rear coil spring part number changes at 12/98. I do know that in 1999, Nissan did a mid-year refresh. Up to VIN -350000, it was pretty similar to the 96-98 models and the rear axle has one shock absorber in front of it on one side and behind the axle on the other side, a design that is primarily used to defeat axle wind-up during hard take-offs from a stop. On the 99.5 models, starting with VIN -350001, Nissan relocated one of the rear shocks so that both were behind the axle. They also changed the front grille, bumper covers and some other cosmetic changes. It's possible they are interchangeable. If it were my Pathfinder, I'd go with the 55240-0W010 if my production date was before 12/98 and if it was 12/98 or later, I'd go with the 55240-AD010. Even better, go with the one that looks like the one on your vehicle!