Some info here:

https://www.ebay.com/gds/Which-Sport...8354533/g.html
https://sportsterstuff.webs.com/products.htm
https://www.883sportster.com/whichpulley

https://www.gearingcommander.com/

 

Also on any of the parts websites where you can see that there are two answers to your question. You need to know if your bike is a genuine Oz import to International spec, or a secondhand US-spec import. Being on the other side of the planet a genuine FSM would be a great idea, where all such info is at your fingertips!