Should be 6x9's in the front and 5 1/4" in the rear doors. Some might have 6 1/2" in the front, not sure. My 2001 came with the infinity system and it has 6x9's in the front.
6 3\4"
there are three sizes 3.5" 6.5" and 6" by 9"
2001-2005 sedan 6.5 and coupe 6x9
The speaker sizes for 97-2001 mountaineer that would make a stock fit would be a 5x7" speaker for front and rear. The Ford/Lincoln/Mercury company is notorious for using this size. You can also double check those kind of figures for any vehicle on crutchfield.com, a leading online audio/video company.
the stock speakers are 5by7 then 6by8
2 4x6's and 2 6x9's
the door speakers are 6.5 and the rear are 6x9
the size is 6x9 in the back and in the front i cant rememeber sorry.
a crappy one
Infinity speakers
245 75 16
The fronts are 6 1/2" speakers and the rears are 6x9s.