l wanna make my sound system better and a little more unique. After looking it up l think l need 6.5'' speakers. l have been looking and l found 6.5'' Blitz Speakers which light up. Would these fit my truck and be efficient? http://denver.craigslist.org/wan/882386539.html

My experience has shown me that you can fit any sized speaker into any factory location as long as you are willing to either add an adapter or cut some metal or plastic.

With that said, Crutchfield.com states that the largest speaker you can put in factory locations is a 6-3/4''. So you should be able to install the 6-1/2''. You might have to stop by Best Buy or Circuit City and pic up a speaker adaptor if they do not bolt in.