Just stop in at a local Vanagon repair shop, they should have one lying around.

Remember, the manual tranny studs are a different length than for the
automatics.  You may want to take the  one you have for comparison.

You could also try a bolt/fastener store.

>Hi All,
>I'm ready to install my rebuilt transmission, thanks to Daryl, but I'm
>missing one of the lower engine studs.