I would stick with Sly's advice and go with the 4" and Crutchfield's adapter ring. It's been a while, but I remember doing just that in my 89 MGM.
Also for the dash speakers look into a pair of "bass blockers" to help them play a little louder without damage.
Also for the dash speakers look into a pair of "bass blockers" to help them play a little louder without damage.
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