just take your stock t tube and measure all the dimensions and make another set of bars with those dimensions. I'm gonna make myself a set of bars, possibly next summer, or march break at the earliest, depending on when I get a welder, because as much as I want rads, the shipping is too much for me, same with simple bars. They're all probably hella good, it's just that shipping is too much for my liking.
Wait, you live in Australia. dude, just get ss bars, probably a lot cheaper than getting all the tools and materials to make them yourself...