I couldn't seem to get mine to fit without moving the entire mount back an inch or so because I couldn't get the seat to lock back. It was obviously hitting the tire, but either my seat fold lever doesn't work right or they were never spring loaded, figured out later that I have to manually lock the seat fold lever in place.
Thus no idea if mine would have fit without moving the mount back , but it was easy to do, I just welded thick washers to the existing "feet" of the mount, and bolted it down. Tire now rubs on the tailgate a hair as the mount moves around as the truck bounces around, but does not interfere with closing it.