There's several different '97 radio's
Mine's an oddball, it uses a small recessed (5)point star - (1) on each side that unscrews.
Similiar to some BMW apps.
I filed down a pocket screwdriver to unscrew & remove
The others are the normal (2) prong the I use (4) peices of solid wire to push in & release the clips (like my RR was.)
Hope that helps.
luck,greg