Sorry to revive an old thread but I could not find the part on the excellent allbrit.de link, nor anything I would be happy buying off of john craddock
(I still have a return for a a wrong product they sent where they have charged me for both and then refunded me £50 less than they should, and I may as well talk to a chocolate labrador than try and explain over an over again that 400 charged for two products, one returned as is, £150 refund for a £200 product does not add up)...
anyhoo, have 300tdi 110 which used to have light, sort of fast and full on, but now only has full-on, which is OK on motorway, but a pain elsewhere, will try Simonb, but open to any offers / recommendations (to do with the thread lol) in meantime given age of OP