The holes are 6" but will take a 61/2" with a thin mdf spacer just to help seal the speaker more than anything.Make the spacer out of what ever thickness the stock speaker recess is in the door.It's like 4 or 6 mm from memory but dead easy to do.
I've had a set a DDDrive splits in the front doors of our EF for about 6 or so years and they still sound great.Remember to put the tweeters in the stock locations in the dash and use blue tack or tape to trial them on different angles until you like the sound of them.The EF is a great car to add audio gear to as they have done all the hard work for you at the factory.
Same goes for the back deck 6" hole but will take a 61/2".I think the sub hole in the rear deck is 8" but could be wrong.A set coax's would be better in the back just for fill if you are going to run a set of splits up front and a sub too,but you would be able to put a pair of 6x9"s on spacers if you don't wan't to run a sub or two.
From memory all the factory speakers were pioneer aswell so it would be worthwhile going and having a listen to there new gear as a direct replacement.
i think ill go with some 6.5", after i make a small spacer, will the door trim sit back on good? ive seen cases where they dont sit very well afterwards. i assume the stock grill with still cover them?
Yes the door trim will go back on without touching the speaker if the spacers are rather thin.But at the very worse you may have to smooth over the plastic heated joins to make more room,but I didn't have to on my car.
Some other speakers may be taller than my DDDrives but it may be worth while measuring each speakers hight to see if it will clear when you go looking for some.
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