Bhante G includes it during metta instructions he gives in Mindfulness in Plain English.
1. May I be well, happy and peaceful. May no harm come to me. May no difficulties come to me. May no problems come to me. May I always meet with success.
May I also have patience, courage,understanding, and determination to meet and overcome inevitable difficulties, problems, and failures in life.
Thanissaro Bhikkhu gives it at the end of the metta instructions he gives in With Each and Every Breath.
May I be happy. May I be free from stress and pain. May I be free from animosity, free from trouble, free from oppression. May I look after myself with ease.
All living beings are the owners of their actions, heir to their actions, born of their actions, are related through their actions, and live dependent on their actions. Whatever they do, for good or for evil, to that they will fall heir."