I just replaced the dead factory 6 x 9s on my 2000 GP GT coupe. I have a pair of 6 1/2 speakers that were previously in an Impala. I had hoped that I could swap the factory door speakers as well, but Crutchfield and Best Buy say the doors are 5 1/4. Is the door not deep enough or the hole not wide enough without taking a Dremel to it?