Crutchfield. The site will tell you what fits. If you can't figure that out you can call.

 

Definitely go the Crutchfield route. for the price of a pair of speakers, they'll include all adapters needed and a guide to install them. Also, they have larger speakers in the door, and a smaller midrange in the dash corners.

 

The challenging thing about buying the JBL speakers is they require 2 ohms so it's pretty slim pickings. Unless you're willing to replace the amp too that'll free up more options.

 

There's no need to use 2 Ohm speakers, 4 ohm work fine. You'll have to turn the volume up a smidgeon to make up for the lower load. Although since they run in parallel, same line runs the 6x9 in the door and the small 3" in the dash not sure how that works.

But, I have used 4 ohm aftermarket speakers as replacements in all our Toyotas since our 2007 Seinna with that understanding of car stereos.

 

have 03 found some JBL 3 ohm 6x9 that fir front and rear price decent models jbl gx9638 search google for them a few online places have them they may have similar for newer camry