have you copied both folder into the car folder? The ext-config.ini has the config to hide the bumpers. Other possibility is to copy the ext-config.ini into every skinfolder.
It's the normal Street Jaguar 'E' Type 4.2 (version 1.2.1) from VELO i think. The Original Full Throttle E-Type may also work. The bumpers are hided by ext_config.ini only for skin Folders ended with _race