Part number is 4E0121103AG. According to the parts catalogue, it hasn't been dropped yet, so in theory you should be able to get it from an Audi dealership. You could also try A8parts themselves as they sell new parts as well. Their phone number is in the header image above. TPS may be an option if you have a trade account with them. If you can't source one from those places, I may be able to find a couple of sources from online retailers I've used before.
BTW Thankfully you only have a few posts, so I was able to find out exactly what model you have. It would be helpful for future queries if you update you signature line to include the car details.
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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
Sold!  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
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