MKIII - What size stock speakers?

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i finally replaced my factory radio to a mp3 capible cd player thank goodness.. but the crap thing is only two speakers appear to be working im excited to be getting new ones soon.. im getting 4" powerbass speakers with built in tweeters untill i get more money to get better ones and replace the tweeters i also was wondering how you would go about removing what ever part of the door panel to get to the front.. i looked in the haynes book but nothing.. as far as the back seat speakers im looking foward to that night mare

[pionneer cd player with custom mounting brackets and wiring hardness fabricated by me] YAY!

^_^