Most Ford's use 6x8 speakers. In the aftermarket world you can use 5x7's if they have the extended mounting tabs. Be aware though that 5x7's are great mids and will not provide the same bass response that a true 6x8 will deliver.
6x8" Front and Back
All 4 doors speakers on the Ford Expedition are 6x8.
What is the speaker size in a 2000 ford explorer
6.5"
Front Speaker Size- 4"x6" and Rear Speaker Size- 6"x9"
4 " x 6" speaker
crutchfied.com has all info on speaker applications
5x7
6x8
6x8
6x8
All Ford Contours (and its Mercury equivalent, the Mystique) came with either a 4-cylinder 2.0 liter engine, or a 2.5 liter V6. In 1998, these engines were rated at 125 hp. for the 4-cylinder, and either 170 hp for the "standard" Duratec V6, or 195 hp for the SVT version.