Hey peter,
I bought the cam lock from supplier on ebay, but I found a place in Williamstown who had a selection of boating hardware: https://www.powerdrivemarine.com.au/
I have only used the cam with my drift chute and what I did notice was that without a top cap on the cam there wasn't enough tension in the cam to keep it locked in and I ended up temporarily losing the chute. Having said that, this was at Campbells cove when the water was quite lumpy but not much wind. I have yet tried out with anchor.
As for Scotty mounts I got some stuff from SLH but found macleanoutdoors (https://macleanoutdoors.net.au/) cheaper for some Scotty stuff. I also bought some scotty stuff when I went back to UK over Christmas