Thanks David,
You seem to have carried out the searches which I would have suggested, so now saved me advising these routes.
Re. Part numbers:-
Since your part is no longer available via. Audi then I would expect that they will correctly advise you if the suffix letter signifies any unacceptable differences. I wouldn’t attempt to seek this advice over the phone, but go along and talk with the Parts chap in person.
Kind regards,
Gareth.