Hmmm, I have a 03 safari awd with the 5 1/4" and seperate tweeters in the front doors the 4x6 in the rear pillars, but nothing in the rear doors. I would like to upgrade, I have a eclipse receiver from a previous van, but not sure on good speakers to fit this van. in my bronco i have jvc and kicker, a concert on wheels!! would like something like that for my van, but want to retain factory locations and wont mind putting speakers in the rear doors so what did you guys do ?? i like bass, but not the vibrating kind the youngsters are into, if i want to vibrate i'll get on my bike.