Exchange AHK “for security”?

Good evening, dear motor-talker I have the following problem: Last week I had a small driving accident with a Dacia Duster. I hit his AHK at about 5 km/h more speed than the Duster. You have seen the Duster nix, and in my shock bar (C1) I have a about golf-size 1cm deep dent behind the license plate. I come up for everything, of course, also told the driver, and he has to check his car for safety. Now his workshop has made a KVA for the exchange of the trailer clutch mechanism “for safety” over 380 euros. My questions are A: Is the damage legitimate? If not, what do? And B: Is the price justified?