For the rear light Bontrager Flare RT we have developed a bracket that fits perfectly to the seat post of the Specialized Tarmac SL7. It is attached
Tarmac SL/Pave Bontrager Flare Post Mount (B4DDNQBJV) by MadBikeSkills
Di2 Battery Mount For BMC SLR01 TMR01 Seatpost Holder SM-BCR2 BT-DN110 BT-DN300
Road Bikes - Bike Mart - Dallas' Best Bike Shop
3D printed seat post mount perfectly dimensioned for the Specialized Tarmac SL 7. Mount options available for the following:, Garmin Varia
Mount for Specialized Tarmac SL7
Bicycling Catalog - Chainwheel Drive Bicycles - Clearwater
Help! Under seat mount for tail light? - Bike Forums
Garmin Varia Radar mount with D shaped seat post - Equipment - TrainerRoad
Bontrager Flare Mount for SWAT Specialized/s-works Saddle
Varia 300/500 series seatpost Mount for Specialized Tarmac SL7 + Allez – Neat Components
Garmin Varia Specialized Tarmac Seat Post Mount (XGAS9HEAX) by MagCAD
Specialized SWAT / Bontrager Flare R/RT Adapter (JUKZ5NUZP) by MadBikeSkills
Cycling give you wings.
Vélo Route Occasion Specialized S-Works Taramc SL7