Just take out the speakers from the speaker box and make a new box for the speakers if they dont fit.
6X9
The size of the speakers for the front door in a 2002 Mitsubishi Diamante is 6 x 3/4 inches. The back speakers are 6x9 inches.
both front and back are 6 1/2" speakers
2004 Mitsubishi lancer speaker size is 6.5".
The Mitsubishi Diamante was a full-size car that was produced from 1990 to 2005. It became the second generation Magna, replacing the Galant Sigma based Magna.
6.5" speakers,4dr and 2dr
There are 2 tweeters in the dash, a 6 1/2 in each door and 6x9s in the back
24 mm socket
cruthfield.com has all speakers stock speakers sizes for all cars -
the rear speakers are 61/4 inch I just dont know what the center speaker size is
Go to Crutchfield.com and they will have all of the sizes of your factory size speakers for your car.
5.25" see Crutchfield.com