If you mean size than 5.25 in front doors, 6x9 in back
IN THE FRONT DOORS 5x7'S BACK 6x9'S
Yes, they can be replaced. According to Crutchfield.com, the front dash speakers are 4" x 6".
The plastic piece that cover the speakers and vent just oulls off and sets back in there when you are done
up front in the driver and passenger doors are 4x6 speakers and in the back on each side is 4x6s and way back where newer cars have 6x9s are 4x10s
5.25 in the front, 6X9 in the rear, for ALL park avenues 91-04, they have tweeters in the front doors as well
16.5cm in the front doors
Im not sure if its the same as a 1990 Buick century you have to pry up the speaker/defroster cover using a screwdriver. The speaker than has two screws securing it to the dashboard.
In the doors front and rear.
The speakers are rather conventional. They are single cone about 5" diameter for the woofer/mid range and of course the tweeter is mounted in the upper front corner and is about 2 1/2".
no
5.25"