This is an original GM small block V8 lower alternator bracket for mounting the alternator on the left/driver's side of the engine. It is cast and has part # 3951337 cast into it. The applications range from 1969 - 1982 Corvette to 1969 - 1972 pickup. I think it could be used in many applications.

Very nice condition, no issues. I've had it in dry storage for years. 

Asking $20.00 plus actual postage.