Accident, cost? What can it cost?

Hello all, I have a little problem… It’s about the following situation: I and a Peugeot 207 wanted to turn right in front of me, where of course the pedestrians have to be taken care of first because they get green light at the same time. So we get green driving off (step speed), the driver of the Peugeot brakes because there were of course pedestrians. I want to also brake but slip stupidly off the pedal and shoot her at a small speed rough f. Have then looked at the damage at the next parking lot… with me the front headlight is broken, is no longer bad… with it (though through the glass fragments which were still on the headlight) were a few deep notches and scratches on the black shock rod which the Peugeot has there. It was the black cover as it can be seen at this:http://upload.wikimedia.org/…/…%BCrer_Tendance_Neyshablau_Heck.JPG As this looks you can separate the thing. park sensor didn’t have any because obviously the place is intended for it, but she meant it didn’t. She wants to have this repaired now at a free workshop at her in the village. But well he will probably also order the part from Peugeot and install it. What do you think the cost will be with the installation ? Many thanks in advance.