My fiberglass bumper had studs that matched the mounting holes of the old rubber bumper & was held on from the back with washers & nuts. These could be easily accessed from the front of the headlight opening once the headlights were opened up about halfway. If yours are attached with sheet metal screws from the back it may take a stubby screwdriver to get at them in this same way. With the headlights partially up there should be enough "wiggle" room to get your hand into the front of the headlight opening and get at them. Good Luck!
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