Today, I was driving down a road and drove past a parked car with another car driving down the other side, and before I knew it, I heard a gigantic bang and the idiot on the other side of the road driving had hit my driver side wing mirror. After noticing, I drove further down the road and parked next to the road to fix the mirror. The actual mirror was half-on and i managed to put it back in all working, but the indicator light plastic cover thing had cracked (but is still on), and I think that I made a mistake by forgetting to put some kind of rubber casing back into its place, and I don't want to take it off the damage it more. The light still works fine, but I am started to feel as if the wires inside the mirror are vulnerable, because the plastic indicator cover thing is cracked.

So what I'm asking is, can you buy one of those indicator light things online? And is there a safe way to replace the indicator light without breaking it or going to the Audi dealership?

P.S. That idiot had loads of space, probably some newbie driver didn't know his surroundi