I had a genuine, swan necked, factory-fitted tow bar on my 2.8 A8 and the rear skirt did have a notch cut in it. IIRC, the genuine ones are Westfalia (?) and, if you check on the web, this model needs a notch to be cut if you have it fitted post-factory.
To be honest, this type was a real PITA! The 'spring-loading' mechanism stuck all the time, so you couldn't lock it properly. I had a really scary experience when my '8 and Davids8 trailer parted company. As I turned right into the dump, the trailer didn't, and it continued down the road alone. 
I had to keep leaving it to soak in WD40 all the time to get it to lock properly.
__________________
2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
|