I am trying to find out what size the factory tweeters are in 6-speaker setup. Also are these tied in with a crossover with the door speakers? If it is where is the crossover located.

I was looking at getting a set of Polk 6 1/2-3/4" components and I would like them to be a direct replacement for the factory speakers. I just need to find out how everything is wired up.

This is for a '06 IX MR.