that conduit is called "Loom Tube" at Jaycar.
http://www.jaycar.com.au/ShowLargeph...id=1485&IMAGE=
Peosonally I think Loom Tube it looks Tacky and Cheap.
I prefer using cable ties.
It allows me to keep the oem wiring flow when cable runs splits up and Small wire runs fitted with Loom Tube look big and bulky.
Another alternative is the "Spiral Binding"...
http://www.jaycar.com.au/ShowLargeph...id=1481&IMAGE=
just wind it around wires to keep them together nomatter what thinkness... cut them to differnet lengths etc. Does not bulk up small wire runs.