It's a little more complicated than a standard radio. There is the head unit, which is a standard single DIN size, which has the display in it. But then there is a another unit which actually has the radio and all the wiring, that get's mounted in a remote location. If you click on the second ebay link above, they have a picture of it.
Remember, there is no CD player. Only the ability to control one. I have a Eclipse 6 Disc in-dash unit mounted right under the 7002. Or you can get a remote 12 disc Eclipse changer or BOTH