I have got a lot of info from here
http://mailer.fsu.edu/~akirk/tanks/
I was under the understanding that the lead plugs were particular to the Australian & carried over the Tasman to the NZ carriers, bieng a more cost effective way of manufacture compared to the "english" pins. I was also of the belief that the local pattern track was based on light tank track, however if the track on this vehicle is correct, and I would assume it is, then that would explain Ron's narrow spoked wheels, local carrier wheels machined down to suit "Vickers" narrow track when "English" wheels were not available locally. Probably the engineering required to change the drive sprocket & track adjuster wheels on the rear to suit local track was more effort than skimming a few wheel castings at manufacture, so was the easy way to go. I don't believe english type track was ever foundered locally, LP1's also using the "wide" track. Colin can you get a width measurment of the road wheels on Vickers, so we can compare them to Ron's wheels please??? I think they will match.
Rob