Ram 2500 Diesel AC Compressor Clutch Coil (Magnet) Replacement for Mopar 05003681AA A/C AC compressor clutch Elecromagnetic Coil (Magnet), with Diode. This Coil will fit your Original (OEM) compressor. It will NOT fit after-market units. Make sure your compressor is the Original (OEM) Halla HS18 Compressor. Please see Years and Engines in Product Description