in all honestly my knowledge on the size isnt very good. But if you go to a car audio store they will easily be able to tell you. Other than that if you do a search in the forums for it im sure its listed somewhere.
Our speakers are 6x8, usually the box will refer to them as "Ford/Mazda" speakers or something like that. Its not as common a size as others out there, so that makes it kinda tough to easily find good replacements.
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