I was told about 6 months ago  that when Ford was the only place to buy
the replacement parts that it was prohibitive. Then the aftermarket
jumped in and Ford jumped out and made the parts obsolete. This was
from another Ford tech. I personally have not worked on these.
If he was correct, the aftermarket still carries these. Sorry I could
be of no more help.

shatt, do yourself a HUGE  FAVOR  and forget the air pump, air ride,
air shocks , and all that comes with it. they make a coil spring kit
for your car that will replace all of it  and it is not very expensive
or difficult to install. i can get you the name and phone # of a
company in my area that sells these, but i bet if you ask around, you
will find some near you. e-mail me back if you need more info.

Try http://www.arnottindustries.com/