Aero covers for the modified Zefal Spin Mirror as supplied on the DF and DF XL Velomobiles by IntercityBike.nl. There is a left and right side cover.
The Zefal mirror slips into the cover. There are supports for the mirror on the inside surface of the cover. Some cement or epoxy is required to keep the covers securely attached.
Note: These are designed to fit the Zefal mirrors with the stem positioned at a specific angle and orientation used in the installation on the DF velomobile. Changing that angle or orientation of the stem requires enlarging the rounded cut out in the mirror cover.
Update: The 2 updated .stl files, ZefalCover-L-Fillet and ZefalCover-R-Fillet, are just slightly modified versions that add rounded edges for improved appearance.