It's always good to be referred to those texts. If only our lives as Catholics were as simple as abiding by such teachings. If only there had been only one Pentecost for Catholics to contend with... If only there were no Vatican II.
The bishops and priests of the SSPV accept the SUMMA and the Catechism of the Council of Trent too. Conservative Novus Ordo Catholics accept them too, according to the modifications or corrections or updatings or shifts in emphasis deemed necessary by the Holy Ghost-protected Vicar of Jesus Christ, the Supreme Pontiff, the Successor of Peter, the dear Holy Father. I don't see how they can be said to qualify as a manifesto of the SSPX particularly.
Should we add to our treasured pre-Vatican II texts the famous pastoral exhortation of Bishop Sarto (later Pius X) on the complete submission of mind and will which the pious Catholic must render to the Vicar of Christ in all that he says and does, even if it does not attain even to the level of the Ordinary Magisterium?
There is nothing from the earlier days of the SSPX which qualifies as an SSPX "manifesto." The famous jeremiads of the so-called hot summer of 1976, which for some Traditionalists qualify as PERSONAL foundational texts for them as Traditionalists, were more of an anguished cri du couer, and His Excellency subsequently distanced himself from them.
To answer a simple question simply: those seeking a docuмent that is along the lines of a SSPX manifesto should go to the SSPX website and check out joint statements made by the four SSPX bishops of the present day about what the SSPX is all about and what's going on with it. That is as close as one will get to anything that could be called an SSPX manifesto.