This may not be an easy install, you may need to cut the old one off. Don't try to break 2 screws as you will need 1 to take to the hardware store for the right size. The easiest way is to completely remove the nose of the bike to get at the key.
Pros
Full Lock Key Set Includes: 1x Ignition Switch, 1x Fuel Cap, 1x Seat Lock, 2x Keys