Need help With Speakers for my Blazer
 

Alright so I read the forums and went to crutchfield but I don't know what is wrong. I have a 2001 Blazer LT with the upgraded Bose sound system. The door speakers in the front are blown and I need to replace them. From what I read and heard I thought needed 6.5 inch speakers for the front doors but when I took the door panel off I realized that the Bose speakers are quite a bit larger than my 6.5 inch speakers. I measured them and I believe they are a 8 inch speaker. So can someone please tell me what kind of speakers I need/provide links to these speakers. Or is there a bracket or something that you put in to make them fit.