Sparky, no part of the body or axle fairing is wider than the narrowest inner vertical plane of the tires. It does not say the axle cannot be aero tubing, it just says you can't have any body parts sticking outboard of the inner plane of the narrowest tires.
We mounted an air scoop on the side one year, tech said that was body/fairing, it was just for a test we were doing, we had the NACA duct with us, to run a comparison.