The 3000 series never fitted in the factory-fitted cradle. It looks like
you're in AU and you've ordered a factory-fitted phone system. Situation
should be as in Europe.
In 'my' day there were no "adaptors". The cradle just accepts a range of
Nokia models decided by Merc. Mine does many of the 6000 series, including
the famous and no-longer-made 6310i. I think some 5000 series should fit
You seem to suggest that there is a choice of cradles now. Even so, you
have to stick with what Merc says. To double-check, try Merc Germany, tel:
0049 711-170, or the website.
For direct contact replace nospam with schmetterling