I replace these in my cars all the time.  All of my cars have had Bosch 
Alternators and I usually buy them for about $25 from the local Hi-Lo 
auto parts store.  I KNOW that the alternator on the Vanagons is less 
than $30.  $56 for a voltage regulator seems real high.

Greg

Gregory V. Robinson
ajax@why.net
tcdfw@aol.com (TwinCell: 2 Cellular Phones / 1 Number)
85 BMW 535i 157K  (BMW Digest)
85 VW Vanagon  135K   (Vanagon List)(H2O-VW List)
89 Jeep Sahara  99K 
80 Kawasaki 750Ltd  14K