Supersprox all the time.

Steel teeth and ali body makes it a real good all -rounder that will last 3+ years on your XT.

ONly sprocket i would use.

The only other alternative is to go to Off the road.de and buy a 45t steel replacement sprocket, but for what you will pay for this and the time it will take to send it i'd go on the Supersprox website and see where your local dealer is...

http://www.supersprox.com/eshop/our_products_stealth.php

Have a look as there may be a dealer/supplier in AUS

Cheers

WB