Top image using a reverse image search says:
https://www.evolutionm.net/forums/mo...iffuser-4.html
Link is from 2009 and broken, but we now know the source.
NOTE: Image also found here with some other Aero-Images.
http://linkpat.info/aerodynamic-shapes-b593.html
Race Car Aerodynamics: Designing for Speed (Technical including tuning & modifying) by Joseph Katz (2006) Paperback
https://www.amazon.com/Race-Car-Aero.../dp/B00NPNUQX0