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I've searched all around and found guides on HOW to do it, but I know how. What I cannot find is the dimensions of the speaker holes? My Type-R is a 2.5in bottom mount and a 2 3/8 top mount. How big of a spacer will I need? Can I fit it under the stock panel? If someone could provide the specs for room behind the hole and from the hole to the grill, that'd be wonderful. Please and thanks.

 
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According to Crutchfields website the speaker fits under the stock grill with a braket (that they include). Dot know the dimensions, maybe someone else will. Can't you remove the door panel and measure?

 
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I can. But I figured I'd try and plan what size wood I'd need before ripping the car apart to avoid having it out of commission for as long as possible.