OK, so heres the deal.
I see people who want to put plate speakers in their Fiero but won't because they don't fit or something, so here's a write up on how I put plates in mine.
I have these: http://bostonacoustics.com/ca_product.asp?ProductID=91
They came with the car and they don't fit because the mounting depth(1.75") is too big. But I did make them fit.
First of all, the mounting hole was too small, so we bought dremel cutting discs and cut about 1/4" off the side of the hole.
My dad and I then went out and bought 1/2" plywood (you could probably use 3/4"). Then we traced the face of the plate onto the wood and cut it out. We cut the inside of the wood out and dremeled it smooth. We lined it up on the back of the speeker and it was the right size. Then we put foam weatherstripping all around the mounting plate to keep vibrations to a minimum. None of the mounting holes lined up, so we bought some sheet metal screws and re-drilled the mounting holes in the car and put the sheet metal screws in to hold it in place I only put 3 screws in, but I tightened the hell out of them so it wouldn't vibrate.
The stereo sounds great, and there's no vibrations. It took some work, but it was worth it. The wiring also had to be extended about 4" or so. Here's pictures of one of the mounting plates.
Dont let the cutting and work get you discouraged, plate speakers will most likely sound better than any normal speaker. Good luck!
Steve
(leave me a + if this was of help 
)
Edited because I can't spell.
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87 GT Auto: New Ignition System, New Stereo System, New Radiator. Fiero WArehouse Scorpion SideScoop. Needs a rear tie-rod to pass inspection.
AIM: derangedsheep | email: elcodjsteveo@comcast.net
SUPPORTING MEMBER
[This message has been edited by derangedsheep (edited 12-04-2003).]
