Here we have the rubber grommet that lives in the back of the stock 9004 headlight bulb electrical connector on all 1986-1991 Vanagons.  The 9004 bulbs are in the two outside rectangular...

This is the factory headlight pigtail for all Vanagon 1980-1985 and needed when converting 1986-1991 Vanagon to H4 headlights.Vanagon  Ref ID: VC162102