Here is another post-1988 quote from Archbishop Lefebvre along the same lines (i.e., No deal with Rome while the doctrinal issues are unresolved):
"I will place the discussion at the doctrinal level: “Do you agree with the great encyclicals of all the popes who preceded you? Do you agree with Quanta Cura of Pius IX, Immortale Dei and Libertas of Leo XIII, Pascendi Gregis of Pius X, Quas Primas of Pius XI, Humani Generis of Pius XII? Are you in full communion with these Popes and their teachings? Do you still accept the entire Anti-Modernist Oath? Are you in favor of the social reign of Our Lord Jesus Christ? If you do not accept the doctrine of your predecessors, it is useless to talk! As long as you do not accept the correction of the Council, in consideration of the doctrine of these Popes, your predecessors, no dialogue is possible. It is useless.”
-Interview with Archbishop Lefebvre, Fideliter Magazine November/December, 1988