The bits circled in blue are the adaptors.
The bits not circled in blue are the calipers.
The calipers are bolted to the adaptors.
The adaptors are bolted to the frame.
You will notice that the front and rear adaptors are different, this is because the mounting points on the frame are different for front and rear.
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Bloody hell LOL time to get to my optician for new glasses. I never even noticed that. yes can see the difference now. But I was convinced both was same LOL. thats the whiskey dumped lol