Here is a walk through to locate any of the Kemet “AC Type” marked capacitors out of the “C900AC SFTY X1-400 Y2-250 Series”. For example, part marking AC103M. Click on Capacitors | Ceramic Capacitors | DigiKey, then type in the “Search Within Results” the capacitance code and tolerance 103M minus the AC prefix. There are no suffix’s on the part marking to call out any physical attributes. Please measure the physical dimensions/lead spacing to figure out the exact part.