What speakers fit in the front and rear? I checked Crutchfield and it doesn't look like too many do- their site only suggests component systems.

If I replace the head unit, can I still use the steering wheel audio controls?

More than likely I would keep the head unit, but run a 4-channel amp. The front speaker and tweeter would be a component system, the rears would be 2-way. Then a powered sub in the way back, probably a 12" 200 watt deal. I'm really fond of Infinity speakers if I can get some that will fit.

Sorry if this has been posted, I searched and didn't find anything.

 

Crutchfield is notorious for being overly conservative about speaker fit. You don't need a component system.

I wish I could tell you exactly which sizes fit but I am totally blanking on that at the moment. Just wanted to point out that more speakers fit than crutchfield says.