This is the same suction cup that was included with the Sirius Sportster Replay, It will work with almost any model of SIRIUS Radio. It features both a slide in mount for Radios like the INV or Streamer GT that mount using a slide in button and the 4 bolt AMPS pattern that is used to mount most other SIRIUS Radios.
The Sportster Suction Cup Mount is compatible with any AMPS Compliant SIRIUS Satellite Radio (4 bolt mounting pattern) as well as the Original Starmate and Streamer GT Models.
The mount will require rear mounting plates (sold separetely) for the Starmate Replay ST2, Streamer GTR and Xact XTR8.
Note: These mounts do not come with mounting screws. They can be found here.