I've had 2 sets of pioneer, they just don't stand up long to the power of a strong amp. I've got the Kappas now, they hold up well.
You might be able to put some 6.5" in there, try
www.crutchfield.com . They have a bracket you mount the speakers to, they fit perfectly. Thats what I put in my old truck I had.
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Rick
My 89lx(updated 2/21/2001)
My 97 Cobra