The mfd and volts should be printed on the outside of the capacitor the higher rating mfd is for the compressor and the lower for the fan
if there is no number on it there should be a mfd rating on the motor and compressor if i had to guess i would say for a 3ton system maybe a 35/5mfd 440v
if you are having that much trouble finding those numbers i would call a wholesale house for that unit and ask make sure you have your serial number too
hope this will help