need I.D. on unknown/misc parts 72 Barracuda

Going through a box of spare parts for my car and I`m not sure what some of this is for.Thanks!

I think the round bracket is for the charcoal cannister.Do I even need the cannister since it`s long gone?

The #`s stamped on the relay are 3513206 36033-k 1 0 8 2

The black plastic pieces are stamped for L.H and R.H. I have no clue where they go.

Little black plastic clips and flat metal plate again no clue?

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