Hey guys i have a 2007 A4 3.2 quat convertible and i was looking to change out the speakers.I have the Audi Navigation plus (Non Bose) I am just about positive the door speakers are 6.5 in but really not sure about the rear speaker size.

Can someone help me out? I was looking to replace the stock with JL Audio C5 series and a nice JBL Amp