At the Oratory of Our Mother of Perpetual Help where I sing chant in the Diocese of San Jose, our rector, Fr. Moreau, is from the pontifical Institute of Christ the King Sovereign Priest. They are an amiable group of priests dedicated to the usus antiquor. They also have the Oakland bishop's blessing to lead a similar community at beautiful St. Margaret Mary Church in Oakland.
The Institute of Christ the King website is a good resource.
If you have the chance, and you are not familiar with the extraordinary form of the Mass, it would be instructional if you could find one of their oratories at their website and visit one of their Masses.