Dear All
Can anyone suggest where I can find square rods and bolts to assemble a metal bed frame? In particular, I am looking for those in the following image: (M8; bolt length 35mm ideally and fits in a 10 x 10 mm square hole in the bed frame)

I can see that these are available on ebay in the EU but have not been able to source any in Australia? It seems they should be readily available given how many beds are in the country, but I've hit a dead end. Thanks in advance.