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Just got an email from Polk customer service, and she said that the 501 has a 1/2" larger bolt pattern, but the same cutout pattern. Also, it does not come with a grill. I'll have to take a look at the dash again to see if that might work with new holes and the old grills.
Mark
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'95 Miata M Edition. '05 Arctic Silver..Nitrons, Arqray Twin Muffler, SectorIII bar, carbon console and shift knob, Schroth harnesses, GUT spoiler, tie rod reinforcement, and lots more....Sold
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