00 ls speaker question

[LSmafioso]

i want to replace the stock speakers im my car, i am almost positive the front are 6X8 and i was jsut wondering what size the rear speakers are if there the same 6X8 or there 6.5 rounds, anyone gimme a little advice would be much appreciated. thanks in advance

 

[LSmafioso]

also wondering the mounting depth for the front and back.

 

[HyeLifeLS]

The rear doors have 6x8s as well. i forgot the depth, but they are about 3", I have Infiniti Kappas and they fit perfectly.