most Ford Truck/SUVs from the late 90's up until now use a 5x7/6x8 speaker size, just make sure to check your mounting depth
6x8 door speakers
The Excursion has 6 speakers total and they are each 6x8's. Hope that helps.
The 2004 Ford Excursion wheelbase is ( 137 inches )
According to the 2004 Ford Excursion Owner Guide ( 226.7 inches long )
On a 2004 Ford Excursion : ( 166.6 liters / 44.0 U.S. gallons )
According to the 2004 Ford Excursion Owner Guide : ( 44.0 U.S. gallons )
inside the door latch itself
Yes
DOT ( 3 ) brake fluid , meeting Ford specification ( ESA-M6C25-A ) according to the 2004 Ford Excursion Owner Guide
all speakers in the vehicles are 6:9's
44 U.S. gallons
The door speakers are 5.25 inches but you have to purchase an insert in order to replace the door speakers.