02 A4 Speaker Mounting Depth
 

Does any one know how much room in the door there is for mounting aftermarket speakers? What is the mounting depth?

I know crutchfield says a 6.5 speaker will work but I know not all speakers have the same mounting depth. I tried doing a search on this but couldn't come up with any info on the 02-04 A4, only the older body style. Thanks, Jon