For 2002 model, front is 6" (stock) with adaptor (can fit 6.5") while rear is 6.5" but the hole (fitment) is much bigger (7" above) due to bracket design for the rear stock speakers.
Attached sample of front 6" stock speakers for your reference. I still kept the stock rear speakers but no photos.
Rear 6x9 stock speakers only apply for 2007 (2nd gen) model onwards.