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You could cut them out to fit but it's a waste. 6*9's only have more bass than 6.5's from the increase in surface area. The problem with 6*9's is that the relative sound quality of the oblong shape is quite bad. An 8" mid-bass driver would be louder, and MUCH clearer.
I highly suggest getting a good set of 6 1/2" door speakers, and an amp that can properly drive them.
The key, is the amp supplying the power. Under-drive them, and a speaker will wear quickly, distrort when it shouldn't, and any lower sounds it can produce, are not very good.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.