Sede Vacante 1769; these cardinals were mentioned in the report of French ambassador dated August 29, 1765; this report mentioned also a fourth "good" candidate, Cardinal Galli, who died in 1767.
"Pope Clement XIV". Catholic Encyclopedia. 1913. The article indicates that there is some evidence that such a document had actually been written and signed by Ganganelli. K. DopieraĆa, p. 366 denies it