These are the upper and lower alternator brackets for a big block Chevrolet motor. They provide for mounting the alternator on the passenger or right side of the car. They started doing that in 1969 if I recall correctly.

Both brackets are in nice condition. The lower one has a tooling stamp on it.

Asking $30.00 plus actual shipping costs. Package deal with the big block power steering brackets $50.00 plus actual shipping costs