The factory uses an acetylene torch or butane torch to soften that urethane. Then they pull off fairly easy. Of course loosen them first! The urethane is available at most automotive glass or body supply shops. It is in a caulk gun style dispenser. use large Vise or C Clamps to lock the fender in place for about 8 to 10 hours till is cures. The mixes are different, so ask on time. You shouldnt have any issues. BCB