Likely 1A towers with or without the extenders.  The raingutter plates
could be fitted as shown in the pix referenced below:

https://picasaweb.google.com/anasasi/SyncroKayak#

Notice the particular locations of the plates.  The spacing is roughly 32"
center to center which matches the spacing on almost all the fixed spacing
devices you might like to mount EG Rocket boxes, bike racks, Thule boxes,
yak wire baskets.  Remember the plates are NOT adjustable once mounted
without re-drilling.  If mounted as mine are there is sufficient clearance
above the roof without using the tall towers on the plates.  Of course my
solution to carrying may not fit your needs.  Measure thrice, drill
oncet.   Using the tall tsdowers may be a necessity on tintop vans as the
clearance is very tight, roof to rail.  On a westytop using the tall
towers with the plates significantly increases the wind resistance both
frontal and side profiles, if any thing of notes is mounted up there.

I strongly favor the excellent racks made by Gary Lee in Calgary to carry
bicycles or other similar loads.

The "tall towers" on my xynkro mount above the front doors and give an
effective set of four crossbars to haul whatever fits.  Including sheets of
this and that, tubing, wood, pipe, stuffed giraffes,  empty coffins  very
long fishing rods, sky hooks, hang gliders, kayaks, the list is ...

Pensionerd

On Fri, Jun 7, 2013 at 8:05 AM, Joy Hecht <jhecht@alum.mit.edu> wrote:

> Thanks, everyone!  Vanagon list is the best.
>
>
>
> On Fri, Jun 7, 2013 at 11:54 AM, Ben <syncro@gmail.com> wrote:
>
> > Joy,
> >
> > The best way to describe them is by telling potential buyers that they
> are
> > intended to fit vehicles with metal roof gutters.
> >
> > Newer vehicles have a rubber channel unlike older vehicles.
> >
> >
> > Cheers,
> >
> > BenT
> > sent from my electronic leash
> >
> > On Jun 7, 2013, at 7:11 AM, Joy Hecht <jhecht@ALUM.MIT.EDU> wrote:
> >
> > > I had yakima racks on my vanagon and I'm trying to figure out what
> > towers I
> > > had.
> >
>