Bought a 2005 Vibe recently, and it came with this Kenwood KDC-108, which I swapped out for another stereo. This stereo comes already installed in the Vibe mounting bracket, and has the correct wiring harness and connector, so it will be a plug and play installation with a 2005 Vibe, and probably any first generation Vibe. Price is $30, and the purchaser pays for shipping.
Here is what you get:
Kenwood KDC-108 CD Reciever
Plays CDs, CD-Rs, and CD-RW discs including MP3 and WMA files
Has an AUX jack on the front panel
Mounting bracket to attach to Vibe dash
Wiring harness installed that plugs into factory stereo connector
While it was in the car I placed a CD, used the AUX jack, and the radio, so everything works.