The PF all had steel front uprights, as did the first 500 FLs in 1999. After that the V6 & V8 petrol had alloy hubs, either in HP2 or Brembo format. The W12 and 3.3 TDI had steel hubs, in HP2 format. Them when the factory 20" cars came along (most 2002s) they also got the steel hubs - HP2 for the A8, Brembo for the S8 & FE.
All the FL rear uprights were alloy regardless of engine or wheel configuration.
If yours has steel front uprights then its a factory 20" car. The alloy ones are a useful weight saving (5Kg each) but you also need different bearings, wheel hubs and lower control arms to fit them so not necessarily worth it.
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