Stock front doors are 5.25". I could not get the door cards back on with the 6.5" speakers installed. I doubt that there would have been a difference from another manufacturer. 5.25" units went in without a problem. The 6.5" sounded better, so that was a bit disappointing.

One thing to be aware of is that the front L and R speakers are wired in parallel, so you'll risk damage to your head unit which will see a 2ohm load if you use standard 4ohm car audio speakers. My Sony's been holding up fine though. <img src="/forums/images/graemlins/lol.gif" alt="" />

If I were to do it over, I think I'd not bother with the 4" speakers, since they add almost nothing to the sound quality anyway. Either that, or go with a 5.25" component set, tuck the crossovers into the 4" dash speaker locations, and the tweeters would look great and be perfectly positioned on the angled portion of our dash.