they are your fuel lines.
this is what I did to them
do an advanced search for threads started by Myki da Pyki. You'll find a thread called fuel lines.
It tells you exactly what you need. iirc it was something like 8mm inside diameter braided fuel injection line. Then buy 4 hosefinishers to make it look pretty.
Costs about 20 quid for 1 meter of braided line (and you have left over) and 4 hose finishers.
Got my hose finishers off Hellperformance on ebay. Cheap and quick delivery