I’ve just had a chat with the chap who sells these, Mark Hemsworth, who’s a former Arrows employee.
You can find his website with all his stock here:
He obtains it all directly from from Williams and Red Bull so it’s all legitimate and the wheel in question above is from Webber’s Valencia crash.
Some parts can go on sale earlier than others depending on how sensitive they are. Key aerodynamic parts might be kept back a few years – Mark mentioned some parts from the 2006 RB2 are only just going on sale now.
Wheels, though, are not that sensitive and so that’s how these ones arrived so quickly. Mark mentioned two damaged wheels from Webber’s crash in Korea are going into the system at the moment.
Mark says he’s happy to respond to questions from anyone looking to buy any ex-F1 car parts so do get in touch with him if you have any questions.