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I looked at that drawing, and I still do not think it will allow calipers to fit 320mm rotors, instead of 300mm, simply by flipping it. Yes, you can flip 300mm versions and fit calipers to 280mm discs. But, the caliper angle also changes ever so slightly each time you move up in disc size (the bottom, or back, of the caliper has to move out a bit so the angle from the center still points to the axle, you cannot simply move it up). Below is a photo of a similar-appearing bracket set that I had to redrill for 320mm discs; note how close the upper caliper hole is to the upper bracket hole! Maybe I am wrong. MikeV
The adapters for the 280/300 and 300/320 discs are different. This is a picture of the ones that were sold by MQ (MotoQuality/Brembo)
G.