I was talking to my local specialist and he advised against getting TRW Lemforder arms as well - although Lemforder are OE the TRW versions he's seen are very roughly cast and carry no part numbers. The 'correct' parts with TRW branding are listed on ebay but I wouldn't take the risk.
Personally I'd order the Meyle HD arms you can get but buy the 20" specific arms from Audi/TPS directly so you at least have some come back if they turn out to be pattern parts.
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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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