mb quart model DKD146 fits great....i have a set of those and a set of alpine 4x6s in my car....i think the mb quarts sound a little better than the alpines, they seem to play lower tones better....
also, infinity and boston acoustics make 4x6 speakers thatll fit our cars....take a look at the speakers in the link below, thats about the only 4x6 speakers that will fit...plate speakers,ones with a woofer and seperate tweeter mounted on a plate wont work without doing some cutting
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14939&item=3095164053&rd=1&ssPageName=WDVW