If it is the regulator pack on the back, i think these can be bought seperately
Be warned..
Water cooled Merc alternators cost a fortune..
I had forgotten that I had the alternator replaced on my E320 Cdi (under warranty) and the bill was £880 !!!
Bring back the days of a £45 Alternator rebuild !
However I also have a Land Rover (disco 2) and wanted to change the headlights over and was quoted 1000 euros for that here!
But I had Britpart ship a pair for £250 inclusive.
I am in the Loire valley near Angers.
And the part is by Bosch.
And I thought 1200euros was excessive too.
David