I checked and part number A 000 471 20 30 (fuel cap with lock undefined) is NLA. But it always is worth asking dealer to check with Classic Center. Some years ago there was another part number for cap with lock cut to your key number form datacard - best to check if this option is available.
I just ordered it and got it for a very reasonable price - it was perhaps 7-8 years ago... I put it in the drawer now, I am using aftermarket part for "every day".