Both front & rear are 6" X 8". Most aftermarket speakers are both 6" X 8" and 5" x 7" size (same speaker). Manufacturers use multi-fit so same speaker can fit both configurations.
firewall 1-----2-----3 4-----5-----6 front of Ford Freestar > driver
Ford Freestar was created in 2004.
On a 2004 Ford Freestar ( 3.9 and 4.2 liter V6 engines ) firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
( 26 U.S. gallons ) for a 2004 Ford Freestar
One reason a 2004 Ford Freestar may stall out is because of a water damaged PCM. This is a common problem with the 2004 Ford Freestar.
On a 2004 Ford Freestar , 3.9 ( and 4.2 ) liter V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
According to the 2004 Ford Freestar Owner Guide : ( 26.0 U.S. gallons )
how can ford freestar 2004 water pump be replaced
The front and rear speakers according to the Metra Electronics Fit Guide are 6x8".
On a 2004 Ford Freestar : The transaxle ( transmission ) is located in the engine compartment on the drivers side . It is bolted to the " rear " of the engine
On a 2004 Ford Freestar : 1-----2-----3 ( bank 1 ) 4-----5-----6 ( bank 2 ) front of vehicle > driver Bank 2 , sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter
According to a website I was looking at : For a 2004 Ford Freestar ( 3.9 and 4.2 ) ( 15 city / 21 highway , miles per U.S. gallon )