I have a 2000 Tundra. I finally have resources to update the audio system. I'm ordering a Kenwood amp and Kenwood sub, and I want to update my 4 speakers and 2 tweeters with Kenwood speakers. What size do I need to get to fit? Also, I want to replace the stock audio deck: single CD changer, cassette, am/fm radio, volume and tuner control. I want to get a better deck, but again, what do I need to look at based on the sizes that will fit where the old audio deck was? Thank you for your help!