Ordered today from the local Land Rover parts dept, $25 for the older style (MTC6223) and $20 for the newer style (VYR500010). To be honest I didn't think they would have them in Australia as the Wolf type tops are rare except for the Perenties and I figured the Army would have their own stock. I was also hoping there may be an alternative to the steel, however on inspection I think it's definitely better to have the stud the sacrificial part rather than the captive part in the sill. Lesson learnt. Thanks for your replies.