I think it will be a bit difficult to find them as used, you could get them new but I guess it would be a bit expensive. Another solution is to built something yourself. I did it for my coolant lines : I welded (2X for each side) a small tube onto a small metallic plate, drilled 2 small wholes + 1 big in the middle, attached them to the turbo and connected with rubber hoses (don't know the right name in English

). It works fine. Don't forget to buy new gaskets though : this is VERY important.
As far as oil lines are concerned the small one is the feed line and the big one is for the return.
Otherwise I know they sell aftermarket lines on Ebay but I think they're far too expensive. I hope this helps