Re: Removing stereo on A5000:

[es61@prism.gatech.edu (Eric Schumacher)]

My 4000 had four small holes in the face of the radio.  A "wire-type"
device is slid in there, releases the catch and the unit pulls out.  No
screws, no trim, no molding to be removed.

I suspect your's is the same.

Eric Schumacher

See your local audio dealer, he can remove it in 30 seconds or less. 
Might do it for free, a dealer near me did for free (I bought the unit
elsewhere and he did nothing but pull the old unit).