Thanks Jim.  Hmmm, maybe the hall sender is just a different form factor than the one I removed?  The former was using all the screw holes under the rotating stator piece and there is a lot more 'hardware' under there.  Pics of that one (before removal) here:
http://picasaweb.google.com/lh/photo/1u85hy5mHGKX_61okvpmUoPPzRFRdLRTF6I6HHY68qY?feat=directlink

From: Old Volks Home 
Sent: Monday, April 19, 2010 8:21 PM
To: Todd 
Cc: vanagon@gerry.vanagon.com 
Subject: Re: New distributor missing hall sender?

The rest of the hall unit is under the rotating stator piece.  remove the retaining circlip, then the stator (mark its position first) and it should be there.  The black connecting piece on the side of the distributor is the exposed half of the hall unit (or should be).  Bosch 1237 010 039 (formerly 1237 010 027).
-- 
Jim Thompson
84 GL 1.9 "Gloria"
84 Westfalia 2.1 "Ole Putt"
72 411 Station Wagon "Pug"
75 914 1.8 (No Name Yet)
Full Timing Since March 1999
oldvolkshome@gmail.com
http://www.oldvolkshome.com
***********************************
On Mon, Apr 19, 2010 at 7:55 PM, Todd <dermultivan@hotmail.com> wrote:

  Just received/installed a 'new' distributor from one of our vendors and the van just won't turn over.  Popped the cap, rotor, dust cap off and...am I wrong...is the hall sender missing??!  I assume a 'new' rebuilt distributor would come complete with everything.  Have a look, and thanks!

  http://picasaweb.google.com/dermultivan/NewDistributor?feat=directlink

  Todd
  91 Weekender