On rare occasions I've noticed 4th gen seats in a 3rd gen- maybe a couple of times. I'm talking about pictures of vehicles for sale on Craigslist, I've not seen one in person. I did help a friend obtain a complete set of 4th gen seats for his 4th gen, from a junkyard. We did the uninstall, and from what I saw the seat frames/brackets/mounting points etc. were the same as 3rd gen. I'm pretty familiar with 3rd gen seats, as I've had mine out a few times and have installed second row buckets too. I can't be 100% sure, but I didn't spot any differences between 3rd and 4th gen for the physical mounting points. I believe the electrical connectors were different, so grabbing both ends of the pigtail may be helpful. You may also need to investigate the seatbelt pre-tensioner that is located on the inboard side of the seat, near the console. Not sure what the setup is on the 4th gen, but likely similar.