Disc front end

can you get a conversion kit (Or something) for a 4 stud disc front end to change it to 5 stud? Or even better can you get the 5 stud rotors?

Sure can, heaps of companies do them, here is just 1

http://www.csp-shop.de/cgi-bin/shop2/shop_main.cgi?func=start&wkid=71446412223

or can you get blank rotors. i only want to get the rotor's not the entire kit.

can you get 4 to 5 bolt wheel adapter plate's in Australia or only from the US?

get 4 to 5 bolt wheel adapter plate's in Australia

Yes Vintage in Sydney has good quality steel plate adaptors, most of the ones from the Us are cheap Tawainese give them a ring 02-9789-1777

These will also widen your front track so be careful with what tyre whell combination you have.