On topic: how does all those posted above have anything to do with skirts?
Three problems when dealing with skirts:
1. Are they effective at all?
2. How to fit them properly to stay still at 60 mph?
3. How to remove them easily when wheel needs to be changed?
Answers:
1. Yes
2. Use the strength and flexibility of rubber polymer glues.
That is: pick some 2 to 3 mm thick aluminum strips. Bend the strip with pliers into shape. Drill and make a thread into one of the ends of the strip.
Glue the non-drilled end with polymer rubber glue (Mamut from Den Braven, in Continental Europe) to the inner lip of the metal fender. Not into the plastic fender liner. If the wheel well was a clock face, use strips at 12 o'clock, 10, 2, 9 and 3.
Bolt the plastic fender skirt to the drilled end of the strips.
From that point on, a fender skirt has little vibration (polymer rubber glues are about the consistency of tyre rubber when fully cured) and rather good resistance to shock. Which is much better than drilling into the metal fender and/or fit some weird contraptions as struts and springs.