bose 6×9 car speakers

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How can I tell if I am buying the right sized speakers for my car?

I am looking to buy speakers for my 2002 Dodge Intrepid SE and I want to know how to see what size to get, I want Alpines because they are Bose quality speakers for poor people pretty much :P I can afford them in other words and they sounds just as good as Bose, and I want to know how to see if I am ordering the right ones. I see 5-1/4", 5x7", 4", 6x9" and I just don't know, I know I might sound stupid but I'm new to the whole stereo system thing, I just bought a 150$ Sony X-plod head unit, so if anyone can help me that would be super greatly appreciated. Here is the link for the site, I'm looking at the Type-S or Type-R speakers. http://www.alpine-usa.com/product/category/speakers/

front 6 1/2'' back 6x9