I am having difficulty removing the front bumper skin from my 1994 Impala SS. I am encountering resistance on both sides in the area where the two 10 mm bolts meet the fender. The 10 mm bolts are out but the bumper skin doesn’t budge. I am certain that all the retainers and screws have been removed. Are there clips holding it to the fenders aside from the 10mm bolts? Can anyone advise?