We link you to the original French of seemingly authentic exchanges of letters between Bishop Fellay, Superior of the Society of St. Pius X and the other three bishops: Williamson, de Mallarias and Galeretta.
The content of the letters speak for themselves. Obviously, these documents were somehow leaked. By whom, no one can tell. Opponents of a reconciliation vary between extreme integrists/sedevacantists on the one hand, and Modernists on the other. Both forces join hands in their opposition to the intentions and wishes of the Holy Father.