6 1/2s all around. You will need to either destroy the factory speakers and use them for adapters or make your own. The fronts use an 8" or 10" adapter in the front and I used Toyota adapters in the rear.
For the Non-Bose system:
What size speakers are the front doors?
Are the back speakers in the doors or on the back shelf?
I'm looking into replacement speakers and have only seen info on the dash tweeters.
Thanks for any help!