I need to complete a RWD SR20DE swap into my S13 but I need another wiring harness and I can't seem to locate one anywhere. Does anyone know where I can get one. The SR20DET harness can be found in many places but no one seems to have a non-turbo Q harness.

You'll probably have trouble sourcing one out of Australia - the S13 was never sold here locally, only second hand imports from Japan. Parts for those type of imports are seemingly hard to come by.