Product Description Attach your radar rear light or bike rear light (both sold separately) to an aero or rounded seatpost with this mount. CompatibilityGarmin Varia:Radar rear light (RTL 501)Garmin Varia:rear light (TL 301)Manufacturer Number:010-10644-12 Contents:1 x Garmin Varia seatpost mount, universal4 x O-rings Manufacturer: Garmin Deutschland GmbH Parkring 35 85748 Garching bei München Germany info@garmin.de