I got a pair of Lightning Audio 6x9's (Pretty low-end but better than stock). I had to do some serious bending/cutting of the rear deck to get them to sit flush. The 6x9's also wouldn't fit in the factory enclosures. I used the bottom half of the factory enclosure, and set the 6x9 with grill on top. Looks near factory and sounds very good. Be sure to use the 4 ohm ceramic resistor for the factory speakers to make your 4-ohm speakers 8-ohm. Take out your rear deck speakers first and look at what you have to work with. You should be able to get some ideas after taking a good look at the rear deck setup. I heard that 5x7's can fit in the factory enclosures, to maintain that stock look. Good luck!
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'94 854 N/A.