Ive done 6x9s with a small magnet on the speaker, a hole saw, and a 1" 6x9 speaker spacer. Cut out the 4x6 grill, unbolt the 4x6, screw the 6x9 spacer to the plastic and into the metal behind it if need be, and then the 6x9 in the spacer. You might need to trim some metal to get the magnet to fit
That's what I did, sounds a hell of a lot better than stock, which is what I was wanting, wasn't looking for nothing special anyway.
Get on Crutchfield and search by vehicle/make/model and it brings up all the sizes and everything that will fit and match. I think you can even view instructions on there for most things in PDF format.
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