Assuming you're buying from eBay US, I don't know what freight & Customs will cost you to Oz, but if something in a no-name kit is poor quality or doesn't last, then you'll have to buy the "right stuff" down the road anyway.
If freight/Customs & the cost of your own time are unimportant, then by all means, give the no-name stuff a try.
But if I were you, I'd do it the safe way and buy OEM.