Arkon SR188-G17 18-Inch Seat Bolt/Floor Satellite Radio Mount Arkon Sr188-G17 15" Seat Bolt/Floor Satellite Radio Mount 15" Flexible Steel Seat Bolt Or Floor Mount For Portable Xm(R) & Sirius(R) Satellite Radios Fits Xm(R) Radios With Single T-Slot Pattern & Sirius(R) Radios With 4-Hole Amps Pattern