Lately, i have install one that lasted... 6 weeks... a Graf.
Why, Alternator bearing went "bazzouk", after that, 2 months later, the
Alternator bracket broke slowly, another pump went with it!

Now, the same guy tought that this V-Belt should be tight as hell! the 3rd
Water pump, an HEPU is leaking again.... all that this pass summer!

So, the conclusion, a reinforce bracket should be made, a good alternator
installed, a new well adjust V-Belt and a new pump.

Cheers, Ben
http://www.benplace.com/vw2.htm