I have been searching for this info and cannot find it... I know the fuel tank is behind the seats, so I don't plan to put speakers there. However, I would like to mount the huge amp behind the passenger seat if possible. I checked and see that I do have enough physical room, so my question is this: How much space is between the metal behind the seat and the fuel tank? Is there enough room to get screws into that wall to mount the amp, or does the fuel tank sit directly against that wall?