Renewing the back side part how elaborate is that?

Hello, After the police ringed at my door today, and explained to me that my rear light was spread over the street I was a little pissed off. But that it looked so bad then I did not expect (see photo). Nartürlich the driver has run away. So I remain on the damage. Tires HL defective, rear light def., bumper, and much more. I think bulging is pointless because the part is totally spoiled. Therefore my question how elaborate is it the side part behind And maybe someone’s got a side part to the favorable course lying around. I’m grateful for every helpful tip.