The application for appointment of a foreign conservator or guardian as conservator in this state shall include the name and address of the nonresident ward, and of the nonresident conservator or guardian, and the name and address of the resident conservator to be appointed. It shall be accompanied by a certified copy of the original letters or other authority conferring the power upon the foreign conservator or guardian to act as such. The application shall also state the cause for the appointment of the foreign conservator to act as sole conservator, if such be the case.