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Does anyone have the hole to hole (mounting holes) dimensions for the various speaker locations? Epecially the mounting hole diameter. Knowing the speaker diameters doesn't tell you that. The woofers in the doors is not a big deal, I've seen plenty of home made adapters on here, but without taking the door panels off and the rear panels off and actually measuring them, there's no way to tell. Not to mention the center channel speaker. I've been considering replacements, but I'd like to get something that will fit, without a ton of modifications.
Center channel is a standard 3.5" speaker, but it will sound better if you just unplug the one that's there.
Rears are standard 5.25" speakers.
Door twiddlers are also standard 3.5" size, so you can make a tweeter plate for that using any speaker. If you don't want to take the doors apart you can buy sub plates for about $25 that easily fit 6.5" components.
If you're just replacing the twiddlers, then you want to buy standard sized 3.5" and 5.25" speakers. They drop right in without any modifications.
If you're going to replace entire door setup with components, you can remove center dash speaker and use it as a template for the tweeter mounts if you want to DIY.