G'day Mick, at the chance of being too simple, what's wrong with the one you have? If it needs reattachment to the bolt assy, mild steel and cast welding is not hard and I'd be happy to sort it out for you. It is probably more complex otherwise you would not have posted. You have helped me with heaps of things so let me know if a repair is a possibility? If so, post it down and I'll fix it. (I know you are very good with your hands too!)
Frank