Just got some mustang seats from a member recently and the rear seat has a extension with a recess at the front of it where a screw on the rear fender is supposed to secure it. My extension is approx inch off the fender. I don't want to crunch the rear fender. Am I missing a part? Does anyone have experience installing the rear mustang seat? I have a 2007c and the seat is supposed to be off 2007c.