Whether Thule or Jakima,  one cautionary thing is make sure the bolts
aren't too long or jagged because they can catch in the canvas poptop
material when it's bunched in the closed position and tear or at least
weaken it badly. They can be sawed off at the inside nut and filed
smooth, with a dab of silicon to make it even smoother if necessary.
The height of the rail can be determined by how long  your upright
towers are and how high you want your rack to be above your  roof.
I've got mine about a third of the way down from the top corner of the
poptop
and that works fine.

Peter Lackner
90 Syncro Santa Barbara CA

On Feb 22, 2005, at 11:51 AM, Dennis wrote:

> This is the Thule version of what you're thinking.  They do have a
> backing
> plate and rubber seal.  The bolts do go through the top but are not
> visible
> from the inside or outside normally as the canvas attaches above them.
>
> http://my.tbaytel.net/guskers/vanpix_files/IMGA0090.JPG
>