How do you remove the rear speakers of a 2000 Buick Century?

I have a 99 century limited(leather seats) on which i replaced both rear speakers, and I believe the 2000 model would be almost identical. you have to take the seat apart to get the speakers out. You CANNOT get to them through the trunk or by removing the speaker grilles, because the grilles are riveted/glued in place and are not designed to be detachable. I have detailed, step-by-step instructions for getting everything apart under the question: How do you remove 1999 Buick Century Limited rear deck speakers that apparently are now defective because the bass is now buzzing with distortion in both?so everything you need should be there. good luck!