The file 'Aero GoPro Adapter For Lumina NiteRider Bike Lights 3D Printer Model' is (stl) file type, size is 121.7KB.
@Vince_Prints' version is really good, but I wanted something a little lower profile and more 'aero' looking.
I trimmed some material so that it would work a little better with my Lumina 750 light. It was a little tight clipping in.