I do have a 78 CX here with a shadow mad Max fairing but if I ever get to building that bike I'm likely to not use the fairing and build it as a custom.
Strangely, I have three 78 CXs that had these fairings, all in a fairly narrow range of frame numbers.
I wonder if these bikes were always together and perhaps had been rental bikes originally.
I only have one of the fairings but three sets of bracketry.
The thingy was one of these bikes.
Like this - but this one's not mine.