After a quick call the the customs hotline (1300 363 263) i have been told that i would be up for 10% duty on the purchase price of car parts, then 10% GST on Parts, duty, and postage.
so even at a purchase price of $1060US + $100US postage (guess)
I am looking at $1470AU.
Plus 10% duty on purchase price $135AU
Plus 10% GST on both $160AU
Total cost would be $1765AU
still cheaper than any thing i can buy new here.