If you need to remove the bumper,it is held on by precious, little. The
hardest part is removing the plastic  plug on the end cap.I suggest
drilling a small hole in the plug and inserting a screw and then pulling it
off.Remove the end cap screw. That done, remove the rubber bumper gaurds.
Just pry them off. this will expose a bolt ot two (must be 13mm).Remove
these and the bumper comes off.