New item. This is for Dunbar, but I am sure someone else might need it too. It is a replacement clamp piece for the Dinotte rear blinking lights, as well as many others that use the same mounting system.

Blinking Light Cervelo S-Series Post Clamp

To use this, just remove the two bolts, nuts and the clip arm from the original mount. and put them in their respective places in this new clamp. This clamp is specifically for the Cervelo S-Series seat posts and will not fit other aero posts. It can be mounted up or down depending on whether you need your light clipped in from the top or bottom.