It was probably about a month or so ago, I hit a mailbox while driving. The mailbox is alive to tell the story, but my right side view mirror experienced a little damage. The plastic cover cracked and fell off. The turn signal blinker works, the actual mirror is still intact, and the mirror can be moved perfectly fine.

I was wondering if I would have to replace the entire side view mirror or if there is a way to have just the cover replaced? Also, about how much would it cost to fix?