I received an e-mail yesterday from "British Only Austria" (Mark Upham's enterprise), it was featuring Ariel Spares.
They appear to have a lot of used original, NOS and pattern stock so might be worth a visit if you're stuck for something:
British Only Austria
Tel. +43 7586 744610 Fax +437586744614
No prices were quoted, but from previous dealings I suggest you're sitting down when you enquire .