you have to remove the whole door panel in order to gain access to the factory speakers in which should be 4x6.
Front speakers are in the door. remove screws on the door panel, then remove the panel and you'll see the speaker
4x6
How do you remove the right rear door panel from a 2002 Bonneville sle
You need to take of the door panels!
How do you remove door speakers on a 1999 chevy tahoe
How to remove left inner door panel of a Pontiac Bonneville 1996
If your talking about the door speakers then you will have to remove the door panels to get to the speakers.
6 1/2 inch rounds
remove door panel, remove speeker.
Remove the door panels and unscrew the grills, then unscrew the speakers
Remove the screw under the door latch
Remove the speaker covers from your 1997 Mercury. Remove the door speaker retaining screws. Remove the door speaker wiring harness. Reverse the process to install your new door speakers.