Hi,

I dropped mine off at a local jobbers supply, It was rebuilt and returned
in a MOOG box.  They hadn't any cores!!!  Took 2 weeks. Cost $360Cdn two
years ago, so keep trying.

More recently... Walmart sells a PS leak fix fluid, can't remember the
brand, but says on label suitble for  Subaru, Saab.... Audi. The stuff
WORKED in my '86 Audi.  Took the whole bottle,1/2 then another 1/2 3 days
later (first half slowed it down nicely) now still full after 3.5 weeks,
the reservoir was leaking down empty once a week, from the rack end seals.
Audi racks are also ZF manufacture, same as VW. I really didn't expect it
to work at all, but $3.99 was worth the gamble.  YMMV!!!  (watch out,
WallyMart sells two other PS leak stops WITHOUT the compatibility list and
WITH a warning to consult repair manual, just too risky)

bye, Tim Smith