Sounds like he will have to source the non-ac pulleys and alternator bracket to use that compressor mount. Maybe not- it has a two groove pulley on the compressor, so may be able to get things lined up anyway.
OP- what year brackets and pulleys do you have? They changed over the years; ie single belt or double belt compressor drive, location of the PS pump due to original inclusion of or lack of an air pump, etc.