Just read up on the difference. Premium system is driven by the built in amplifier of the head unit in the dash. It has the lower power amp that's built into it. You also don't have the 8 inch subwoofer or its amplifier in the passenger rear. The cd changer, and cassette radio head unit are similar, but the wiring is different. You can go with a factory unit online, maybe Ebay, or one of our members has one. If you go oem make sure it's not the Mach stereo, but the premium one.
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Thx Moose!