Kawasaki Forums - replacing mirror, 06 Ninja 650R

My step-son bought a 2006 Ninja 650R. It's his 1st bike and he dropped it a couple of times in the 1st few months he had it. Nothing bad, it just got away from him, usually while stopping. Anyway, he was at work and it got backed over by a dually truck. GREAT! It was fixed pretty much back to new. He hadn't had it for 3 hours, was pulling back in the driveway and dropped the damn thing again. Arghhh! It broke the left side mirror. I bought a new one for him for Christmas. But, I can't figure how to attach it. It looks like it bolt onto the ferring somehow. The piece that attaches to the ferring is still OK. It's the arm that broke off. Can I just leave the base on the ferring and then attach the new arm and mirror to it? Or, will I have to replace the base, arm and mirror? If so, how the heck do I replace the base part? Thanks, Greg