Hit and run by a Mailman

[Pediaflyer]

Yesterday, my new 2004 H2, was hit by the side mirror of one mailman little car, and i have to park, jump and run behind this guy..., because he has no intention to stop, they dont have a license plate, so i whrote down a number on the upper corner of the back of the strange car... he notice the action, an came back then, to shorten this insane episode, he agree to pay me later, and he pay me in cash cause he don't want his supervisor to know about the accident??? ($1,204), but i notice everything else is working perfectly, how or where can i find only the broken mirror and replacee it myself? Thanks for your help.