I have an '11 screw with the Sony 5.1 audio. I'm using the stock HU but I've replaced all of the door speakers and sub; however I havent done anything with the center dash speaker. Has anyone replaced this with an aftermarket speaker? If so do you have any suggestions? Does anyone know what size it is?

 

I think the stock center channel is a 3.5" speaker. I couldn't find any recommended replacements though.