Fr. Corey, the monsignor’s zucchetto is slightly different because it has the magenta piping on it. I did find a Roman Pontifical on ebay, but its the 1962 edition.
I had tried Catholic Book Publishers and Liturgy Press, but, since the Roman Pontifical is reserved for bishops, they don’t publish them on a regular basis.
Now, another source that just came to mind is the United States Conference of Catholic Bishops-Liturgy Office. Maybe Msgr. Moroney, the BCL secretary might provide some direction.
Another option is a book called the Ceremonial of Bishops, written by now Bishop Peter Elliot.
Whoever is looking for the Roman Pontifical did not mention why they needed it. If it is for the Cathedral, the Bishop usually brings his own with him. Ditto for whenever the bishop goes from parish to parish administering the Sacrament of Confirmation.
You would need the Roman Pontifical only if the rituals called for the bishop.