By dealer install, I presume you mean the Dealer-installed Sirius. It looks nothing like that; the only obvious sign of the Sirius install is the Sirius antenna on the roof. Its cable goes under the trunk seal to the back glass seal, then snakes around under that to the middle of the top edge of the back glass. From there it goes ~4 inches towards the front of the car. (The antenna is maybe 2" long by 1.5" wide by .75" tall.)
This is what mine looks like:
View attachment 10981
The dealer-installed Sirius unit is controlled through the factory head unit, so there's no external display.