Crutchfield was very helpful
The Avalon front door and rear door speakers are 4" diameter speakers. However there are many options on what to put back in the holes as theres room for 6.5" speakers. If your wanting factory setup with factory radio it doesnt matter size as long as wattages close to whatever radio or amp you have. Depends what your looking for mid and tweeter clean sound or more crisp base then 2or 3way which is more than 1 sound I personally love components with a separate high. But then your talking needing an amplifier to push them nicely. I would go to masters there cheaper and honest. Roger's is ok for dealerships but they charge alot for personal customers and tell you what they want you to have and rarely have in stock any sets.
Thanks! Your answer is awaiting moderation.