'98 A6 radio fitment

[John Cody Forbes]

I'm working on a '98 A6 sans radio. Friend/owner wants a factory unit installed. I don't have the console nearby to see what size hole it has for a radio.

What radio is correct for the car (Concert?)?

Also, if somebody wouldn't mind posting the link to the VAG radio blowout page one more time (I didn't need a radio so I didn't pay attention) I'd be much obliged.

-Cody (mobile)