Michael....
With regards to golf euro bumpers and euro rebars, my experience has shown:
You can put a euro bumper cover on a US rebar (after you remove the foam padding)
You cannot properly fit a NA bumper onto a euro rebar.
The differences in rebar designs is most obvious when viewed from profile...the euro one has a half moon shape body, while the NA spec one is a heavier gauge squarish steel beam.
due to these differences, If you really wanted to fit the headlamp washer system to your car with the NA spec bar, it would need serious reworking along the upper edge to mount the washer jets.
It's not worth the effort.
I dont know if the jetta wagon (actually the bora euro) rebar will fit on your car. It may, but not perfectly.
Again, the possibility of an imperfect fit doesnt make it worth it to go this route...
So, I would suggest that if you're going to do this mod, the right way is the easiest way.... get a euro bumper cover and rebar (you'll also need a euro bumper strip and lower valance) and be done with it.
FYI- I know someone who can get the hella washer kit from Germany for $225