They are 5x7 or 6x8. Either work.
Front and rear speakers are 6 X 8.
5x7 front & rear
the speaker size is 5x7 all around.
both front and rear are 5x7.
16.5cm in the front doors
most ford explorers have 5x7 and you might fit an 8 in the door.
Correct STOCK size is 5" x 7" for front and rear speakers. You have to cut the doors metal to make 6x9 speakers fit. REFERENCE : http://www.modifiedlife.com/1999-ford-explorer-car-radio-stereo-wiring-diagram/
In the doors front and rear.
2 front door speakers 2 tweeters in front doors 2 rear door speakers
Front & Rear Doors take only 6x8 speakers
There are 6 speakers in total; two rear speaker located in the doors, four front speakers; two in the door and two tweeters near the airvents next to the front doors.
5.75 inch speakers are in the front and rear doors