Hi Matt, is it the rear bracket that bolts onto the head? if so you have to take the starter motor of because the top of the solenoid is in the way, and there is not enough room to unscrew the bolt out all the way.
When you put the plate back on if you screw the bolts up but leave slack, (so it floats its easier to mount the exhaust) re-fit the exhaust, then tighten the bolts up using an open end spanner.