Ken , I fitted my sub frame with a 13 tank but the tank don't fit so good , was really loose in the frame and moved around a lot , hence the front of the seat would move side to side ,so have put the 12 tank back on and every thing fits fine have also made a strap to fit on the front battery box mount to fit under the front seat mount , a little bit of playing around will get the shape right , good luck .
Tony
Tony
