Yeah I dunno, it took me by surprise because I cut off 5/8"(just like the picture in the beginning of this thread where he marked with a sharpie on the plastic) and then it just wouldn't go all the way back. So I inspected it and used a tape measure to figure out I needed to take another 5/8" off. It pretty much takes it off at the end of the white plastic. I even used the same exact mini saw he did
. No spacers under my seats, I don't personally care for that method.