Looks like Amazon has them in stock at this time:
Many others here have recommended the Polk DB401's for rear, with some modification, and DB501's with some finagling for the front. The 401's apparently will require some removal of plastic behind the speaker to allow fitment. 501's just need the mounting slots cut out and extended. Do a search here and you will find plenty of info.
thats what i did.....works great:bow:For relatively extra work, can fit db501's in the rear.
Just gotta trim two edges of the speaker frame with tin snips (no grinder - metal particles getting into magnet).
In a stereo shop, they had them both set up. There was a significant difference in sound.