The following image should help in identifying all the relevant fasteners required. Based on the image, these are the associated part numbers, and how many you require per side. Note that these totals are for both parts of the wheel arch liner on either side of the car, and not just the front part. I've also attached images of what the part numbers look like in reality.
And yes, part numbers 12 and 14 are the same. Must be an Audi thing!
#10 - 171201969 - Hexagon collar nut (8 per side)
#12 - N90250001 - oval head panel screw (2 per side)
#14 - N90250001 - oval head panel screw (1 per side)
#15 - 4D0807300 - Spreader rivet (4 per side)
#16 - 443821699 - Clip (2 per side)
#17 - 811807577C - insert nut (1 per side)
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs -
Replaced alarm horn,
Replaced Coolant Temp sensor,
Updated RNS-D firmware,
Installed Reversing Camera and Digital TV,
Dashcam Installation,
Retrofitted Rear Blinds,
Auto-Dimming Rear View Mirror,
Chrome Boot Struts
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2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs -
Fan Jet Windscreen Washers,
Retrofitted Electric Side Blinds