Jesse,
Ace sells a neat sealant called Black Jack that is neoprene, its gas and oil
resistant and comes in a caulking tube. you can build up a ring inside to
fill just the ends. I would make sure you have a small drain hole in the
lowest point and a small one up top someplace to allow it to vent..  Its
pretty heavy metal so it should take along time to rust through. If you have
salt roads you might want to tap it with a mallet once a year to make sure
its still got some metal left in it or you will be draggin vanagon engine
down the road.

Cheers.
Doug
----- Original Message -----
From: "jesse johnson" <jjmojo@BLAZENET.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, February 29, 2004 6:27 PM
Subject: Rear engine support bar question....

> Hey all...
> My rear engine support bar end caps were falling out due to rust around
> them.
> So i pulled them out. What should i use to seal the ends back up to
> keep water from getting inside?
> Or has anyone just drilled drain holes in the bottom of the bar to let
> the water drain out?
> Any thoughts or experience on this?
> thanks everyone,
> Jesse
> 89 carat