What are these called and where can I buy them?

RustyRatRod said

Those are called peedlepods, portasnorkels, doohickeys, whatchyamacallits and thingamajigs.

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No, they're do-dads.
They shouldn't be hard to find used, and usually free.
My suggestion is to place a wanted ad on here with the pictures you posted describing what you need and how many.
Most A-Body cars had them at least from '70 and up........