Apart from what Tim has said go and speak to Mark at MDG...
http://cgi.ebay.co.uk/1A156-ALTERNATOR-JEEP-Grand-Cherokee-2-7-CRD-2001-04_W0QQitemZ330311685445QQ135 quid if you trade your old one.
reread this thread again....Is it alternator AND clutch???If so a decent car leccy place may be able to repair the alternator
Are you sure they don't mean the clutch in the alternator pulley? this is a freewheeling clutch a bit like a ratchet which allows the alternator to freewheel in one direction reducing vibration through the belt. If this is siezed it will make the belt tensioner vibrate like buggery. The pulley assembly is available as a seperate item.
isnt this the same engine on the sprinter? or is that the older version? if so there must be a lot of them about in vans and van drivers dont pay a grand + for alternatorscotty
In the '05 parts catalogue the alternator pulley is listed as a replacement part so should be available.It is part #53013 554AD. Phone a dealer and get a price for this part.