This is a lower compressor bracket for a 60's to 1970's Chevrolet small block with air conditioning.  The part number is 351691 fits small blocks with under slung exhaust manifold and has some differences to another similar part with number 3995607.which fits underslung exhaust manifolds.  Mostly the 607 has full webbing between the two mount points whereas the 691 has aboutt 1/2" setback off the manifold for the webbing.  There is another that is for ram horn manifolds that is listed elsewhere in my store.  Please choose the correct bracket for your needs and indicate when you make a purchase.  Free shipping, usually same day