Please help for finding parts!

I had a 1997 A4 1.8T Quattro, but yesterdays when I driving for year check, I found that the servosteering had oil leakage. Sould I needed to replace
a new one, or any repairing kits for the oil leakage? Also, any suggestion to buy parts in lowest cost?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.