This happened to me and it is an easy fix.  Just takes time.  What you
need to do is get the bracket and peripheral stuff out of the way. 
You also need to loose the engine tins on the back side of the van. 
That will allow you enough room to get a drill in there.  I was able
to get my dewalt 18 volt in there no problem.  If you are worried
about space go get a 90 degree drill and you will have no issue.  If
the studs are just broken you are in great shape.    Take a nail punch
and lightly tap an indent in the broken part of the stud.  Drill in
thier with a small drill bit.  Then use an easy out.  This will go
into your drilled hole and catch it and spin it out.  If it is
stripped or isnt going to come out then you have to drill it, and tap
it, or use a helicoil.  Either method will give you the same result. 
I think drilling and tapping is always the best because coils
sometimes wear out.  This repair can be done no problem with the
engine in the car and some time spent on the issue.  Don't be afraid
and dam it drill straight and in the center of those bolts or you are
going to cause yourself a mess.  Also you might want to figure out why
they are broken.  Mine was due to a vibration that ended up with me
rebuilding my drive shaft, and tranny.  I was loosing bolts and
brackets for years before my tranny went and after i rebuilt it never
had an issue with this type of thing ever again.  Thank god because
although it is not a hard fix it is a bit stressful.
Adrian

On 2/7/06, Roger Sisler <rogersisler2000@yahoo.com> wrote:
> If you remove/loosen up some perferal appendages around the engine
> compartment,and remove the 4 bolts that hold the engine carrier to the
> frame,can you drop the engine/trans assembely a few inches to get clearence
> to use a drill? May have to take the exhaust off at the j pipe to the tail
> pipe in one section. Just wondering, as I thought of doing this to replace
> a main seal without removing the engine.Could stick in a new oil pump at
> the same time, I think.Good luck.Sorry to hear about the bracket snafu.It
> seems marginal in stregnth to begin with.
>