The product fits in the rear upper cab corners of a 1990 GM truck. (GMT-400). You will need self-tapping screws or a homemade bracket. They don't fit in the corners of the dash as the 4" speaker is offset to one side of the 4x6 hole which is very shallow and narrow by default. I opted for the higher end 4" kicker pickups that came with adapter plates from Crutchfield. I would still order from Crutchfield if I were you. Very comparable prices to Revain and they send you mounting plates and speaker harnesses and they really have one good customer service.
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