There aren't any brackets as such, the radiator has two flat sections pointing upward from its upper edge with rubbers in holes in the end, the right hand one hangs on a peg on the frame just below the headstock and the left hand one bolts to a similar peg on the other side.
The lower mount is on the front cylinder head cover, again there's no separate bracket - another flat strip that's part of the rad has a bolt in arubber to the bolt hole in the cylinder head cover.
Look here:
Click me! The upper fixings are apparent, the ring of the lower one can just be seen above where the number '12' is in the drawing.