The MagCAD and Trek mount together allow you to mount your Garmin Varia rear radar light underneath your Trek saddle neatly. The MagCAD mount also works with the Bontrager Blendr Saddle Accessory Mount (Trek model: 573143 / 5283888) to mount your Varia to compatible Bontrager saddles such as the Aeolus, Commuter Comp and Boulevard, which have two threaded inserts on the underside.
