i searched, but can't find what size screen fits in the 03 casing?

 

u need a new face plate, then after that u can put the 7inch Z1 thats the biggest that i kno of...

 

I know i need the Double Din Kit with the face+AC controls am i missing something else? (besides the screen)

 

you may or may not need the bracket

 

You will not need the bracket if your willing to drill 4 small holes; the guy that installed mine says this is all that is needed and the places are already 'dimpled', just not drilled...
My installation is nice and flush