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I've got standard mount 2 way 6 1/2 pioneers in the doors of mine. It shouldn't give you any problem as long as the speakers aren't ridiculously deep. However on my truck, the original screw holes in the doors were stripped so I drilled new ones, but this didnt change the stock depth of the speaker, I just turned it a little and relocated the holes.
Excellent, thanks for the help guys. I really need to replace the stockers in mine, so i will search for the slimmest profile 6 1/2 speakers I can find. I bet the connectors will be different so I will probably have to re-wire up to the back of the deck.
You dont have to mess with the rear deck, just cut the plug off of the original speaker connection at the door and use the supplied new connectors that your speakers will come with. And dont worry about going too shallow. As long as you dont get something extra deep you shouldn't have a problem at all. My 89 should be exactly the same, and with regular pioneer 2 ways I have some room to play with. Good luck with it