I thought this would be an appropriate interview for people to know and understand Monsignor Perez and his story and stance in light of his recent passing. Stephen Heiner is the interviewer, who was himself transitioning into the sedevacantist position at the time of this interview in 2011.
Starting at about the 19:00 mark, Monsignor Perez makes his case for the pre-55 Missal. It's quite compelling IMO.