Sorry didn't see this until now. Are those 6.5" in the kick panels? Before I added anything in the back I would raise the front stage. Installing an efficient set of components, powered by your radio, with the tweeter in the upper dash or A-pillar area will yeild better results.
If you still need rear fill, I would use 6.5"s as the have (roughly) the same output as a 6x9 and a much smaller hole. If you are using the speaker grilles, I suggest something from one of Boston's lines. The styling is very conservative with a bunch of chrome and crap.
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