Leo hks180 in Sydney, Illumo in Melbourne and Jamie Loudz Creations in Adelaide all do custom headlights. You can get custom via yahoo.jp as well.
Headlights are specific to pre & postfl. All prefl headlights are interchangeable but jdm prefl hids are technically illegal in aus. Postfl have either stock non hid or hid w/headlight washers and levellers. Interchangeable but not legally so.