>> Perhaps the plastic "lip" is sacrificial - easier to replace after a minor scrape on
>> the widest part of the bodywork than a costly paint job.
It's not big enough for that, and it's not at the widest part either.
I found this
"...European regulations dictate that fenders must cover the entire tread width as measured from 30 degrees forward of the tire’s top center to 50 degrees rearward. Black plastic fins like those you’ll find on the Jaguar F-type allow stylists to create that provocative view while still adhering to the letter of the law."
www.caranddriver.com/news/a19660495/designer-genes-how-regulations-dictate-the-look-of-new-cars/
They must just work to the widest common denominator - my MX-5 has the smaller of two possible standard sizes and has the same spats as the other variant.
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