Try Meyle HD to see if they now make an equivalent part - annoyingly Audi specced a larger balljoint on cars that left the factory with 20" rims. It makes it amusing if 20s have been retrofitted as they'll have the 18" spec parts......
At the last time of looking those specific arms were OEM only, but worth checking Meyle as the most likely source of a replacement 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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