Jim he's looking for a serpentine pulley to replace the vbelt pulley on a compressor. Everything else is serpentine already.

Most big rig shops carry serpentine pulleys for these. A Kenworth part number is KA-1480 for a six groove pulley or KA-1485 for an eight groove pulley. They run $85-100 new. Freightliner, Peterbilt, and others also will have them.

Some mid-80s Mustangs had Yorks w/serpentine pulleys but they are rare. You might also find a serpentine Volvo.