You can't get individual HPFP parts. Not from VW at least. You'll be taking a gamble with second hand parts. A brand new Hitachi pump is approx £280 GBP. If Brunei dealer pricing is consideraby more, consider getting one shipped from the UK or US, which ever is cheaper. These pumps are very easy to mess up, especially the piston seal if you pinch it during assembly. You will fill the oil sump with fuel.