Jeff,
Check Auto Zone (FLAPS)...I found one for my 85 for about $170...including
core charge for your old one. These are refurbished units, thus the price. I
haven't installed one yet, as my PS fluid leaks less in the winter :P...but
it will be necesary in the summer when I drive it more. You may only need to
replace the seals, as opposed to the entire rack. Perhaps someone on the
list can help you further diagnose that.
I also ran across a site last year that gave details on replacing the
rack...a search of the archives didn't find it. Anyone know whose site that
might be?

Tracey E