How to Import VW Parts Directly — Cheaper Than Local Agents?

I'm tired of paying 3x markup at local VW agents. Has anyone successfully imported genuine VW parts directly to Sri Lanka? I know Euro Parts Lanka does this, but curious about the DIY import route.

Questions:
- What's the customs duty on car spare parts?
- How long does shipping take from Germany/UK?
- Any recommended online parts stores that ship to Sri Lanka?