I suggest extending the light faring as far back as possible or practical, perhaps even conforming to the forum's aero-template.
Inspiration seen below.
Aerodynamic Low Profile Smoked Lens LED Cab Roof Light Fot Truck
If you have to build a large cone as I did for my hovercraft, you can use your car/truck as a lathe. A longer cone than the one I build is recommended, I had other design constraints.
Hovercraft - Experimental Skirt Project - Page 2 - Boat Design Forums
Hovercraft - 4 years of tinkering it's working again - Pelican Parts Technical BBS
Your lights are so small that you could clamp a drill in a table top vice and rotate a foam plug from there. Getting the speed slower than that would make it a safer operation though.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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