The heater core looks a bit different on the 130, but the KEY heater hose that I had to replace on the 230 was done best with a Holden Injected 5.0L Heater Hose, the one that goes around the square manifold on the 90's Commodores (such as VR). Keep this in mind as it may be very useful due to the oddly spaced corners etc.
yea thats exactly what i came up with.
went to supercheap and grabbed a selection of hoses. the engine bay ones are not too hard, Its the curly one under the dash that has proved impossible to replicate so far.
Might make it up out of 5/8 stainless and just use straight rubber joiners at the ends.
will put a few pics up in a few weeks when i have finished