I received my rear 172 bumper and my new sport grill today in the post, the grill was so easy, took about 10 minutes to figure out and fit. the bumper wasn't so easy as I had no idea where all the fixings were, as I removed the arch liner on the rear passenger side for access to the bumper bolts the bolt that sticks out from the bodywork snapped as I tried to remove the bolt because of rust! (the one nearest the tyre and the spring) I guess my question is are arch liners needed? as I think if I try and replace them it will now maybe droop down on to the wheel when I'm driving because of the snapped bolt