Picked up a radiator overflow bottle from supercheap for $23, it is a nice little bottle that will sit nicely in the car. I wanted to make up a neat bracket to hold it in as the way it was designed to mount wont work with where i want to put it.
Aluminium angle cut at 45deg
Welded up on the outside, i also welded the bottom as well.
Sitting in the mount, thinking about how to secure the top section to the mount.