The Pietralata Message
No complete list of signatories of the Pietralata Message seems to exist.
Marguerite Fiévez compiled an apparently incomplete list. Of these, three had also signed the Pact, namely Enrique Angelelli, Julius Angerhausen and João Joséda Mota e Albuquerque.
This is the list as compiled by Fiévez:
Bishop Jose Vincente Tavora (Brazil)
Bishop João José da Mota e Albuquerque (Brazil)
Bishop Edmundo Kunz (Brazil)
Bishop Antonio Fragoso (Brazil)
Bishop Enrique Angelelli (Argentina)
Bishop Feliciano Gonzalez Asciano (Venezuela)
Bishop Albert Sanschagrin omi (Canada
Bishop Gérard Couturier (Canada)
Bishop William E. Power (Canada)
Bishop Georges Béjot (France)
Bishop Julius Angerhausen (Germany)
Bishop Mauro Repullés (Spain)
Bishop François Ayoub (Syria)
Bishop Jérôme Louis Rakotomalala (Madagascar)
SOURCE
Stefan Gigacz, Pietralata: The forgotten Mass and Message (Cardijn Research)