Actually I have their number... 0393695712
Melbourne branch of these ppl - ASI Performance - http://www.ebay.com.au/itm/Nissan-R32-GTS-RB20-RB25-silicone-radiator-hose-BLACK-/290578650137?pt=Motors_Car_Truck_Parts_Accessories&hash=item43a7d65419
From memory it was something like 4 Weddel Ct Laverton, just an office/warehouse in an industrial area really.
I actually went in there and picked up my hose kit a cpl months ago and he had heaps (at the time). I actually spoke to him on Friday about a kit for an RB20DE for a friend and he said he only had top/bottom hoses in stock. The kit (which excludes those) is $170 pickup but 1-2 week wait.
I was told it would be $600 to replace my hoses from Nissan.. pfft, plus something like $80-100 for either the top/bottom hose I forget which.. either way I'll just swap them again.. if I still have the car at that point..
I do see your point about the hoses underneath tho. My car is in pieces tonight.. more hoses splitting.. And I saw one short hose that runs from a pipe out of the block (joins to bottom hose) and into like.. well the top of the oil filter..ish (haha very technical).. anyway NFI how you're supposed to get that off lol.. was like wtf
I should take a photo, just makes no sense to me..