Here's what the floor looks like in a 2015 LWB XLT after you remove the 2nd row bench seats. As you can see, the 60/40 split leaves a wider gap on the drivers side. I'm assuming your 2nd row buckets have equal mounts on either side. But you may be able to see if the bolt holes from the 2015 bench are still present. The front bolts for the seats all atttach to that single crossmember just behind the rubber mat in the photo. And you would also need those black brackets at the rear under the carpeting in the photo. They are just bolted into the flat floor, but they are the latch points for the folding seat.