A and AA - You need four such clamps to hold the bars; two below and two above.
B - I agree with Kato
D - As Kato says, those are the clamps that hold the muffler. Those clamps are lined with E as a cushion. Usually only one complete clamp is shipped. Looks like you have a spare.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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