I recently purchased a set of the MRF bar tread tyres, 9.00 x 16 inch for my F15a.
I went into a local tyre place who was having a sale of tractor tyres, and I asked him about bar treads. He showed me a catalogue and there they were. It took him a couple of days to get them from Melbourne, and Voila! It was good to get them so easily, and at a good price. This tyre dealer is an independant, so he could get any tyre. I believe that Tyres R Us can get them in Sydney.
Can't wait to find the time to fit them.