This kit requires a compatible BUP mount base.The Top-Center (TC) Model sits lower and closer to the saddle and is less likely to rotate under load
Garmin Varia Mounts
OCA FX Universal Saddle Mount Base
Direct Mount Base for Fizik Saddles with ICs Slot
Mount Arm Kit (Tc) for Garmin Varia Radars (top-center Layout, Includes Tether)
Saddle Clamp Radar Bike Mount for Garmin Varia RCT715, SWAT LYNX TREK STEALTH
Cestbon Radar Bike Mount for Garmin Varia Rtl510 515 TL300 and Garmin Varia Rearview Radar Tail Light. Saddle Bicycle Mount : Electronics
Direct Mount Base for Fizik Saddles with ICs Slot
Varia Mount
Garmin Edge 1040 Bundle GPS-enabled touchscreen cycling computer, plus heart rate monitor, speed sensor, and cadence sensor at Crutchfield