HELLO EVERYONE. DOES THE INSTRUMENT PANEL (OR DASHBOARD TOP COVER) POP OFF (OR UNSCREW OFF)? THE '74 BODY MANUAL IS UNCLEAR WITH A VERY BAD PICTURE. WE OWN A '74 PONTIAC GRANDVILLE CONVERTIBLE. (OBVIOUSLY, THE SPEAKERS ARE SHOT, AND WE'D LIKE TO REPLACE WITH NEW ONES). THANKS