Jango as mentioned above I replaced the complete steering rack /servo item. Not cheap and the fitting either but worth every penny having my car back! Simply a joy to ride now with all the new bushes and everything else.
I used a used one as there good ones out there from breakers. Low mileage recommended but not guaranteed.
stubunceand
davidbirdthanxs a bunch.....
on a Pre FL RS MODEL the part you need is
061K1423051CD
or
081K1423051CP
other heavier cars like TDI may have similar numbers but I do not know if would be 100% compatible