Usually, the back speakers are 6 x 9 . Check with Crutchfield.com to be sure.
Try Crutchfield.com. They can match your car to the correct speakers, but I'm sure you can fit 6 x 9's in the back.
The 2003 Buick LeSabre has speakers in the doors of both the driver and passenger side. These speakers are generally about 15 inches.
a 1991 buick skylark has 4" speakers in the dash and 6x9's in back
What size gas fuel tank does a 2001 Buick lasabre have
6" x 9"
What size speakers go on the rear of a 2001 Buick lesaber
If you mean size than 5.25 in front doors, 6x9 in back
In the back it's 6x9" easy to change too.
I think 6x9's would fit in the back. Try Crutchfield.com.
The tires on my daughters 95 Lasebre are P205/70- R15
IN THE FRONT DOORS 5x7'S BACK 6x9'S
probably 3/8"