Howell will play Frank Eagan, "an ATF agent with questionable loyalties," while Howey will appear as Hopper, "a hardcore north Vegas member who crosses paths with SAMCRO."
In Season 6, fans can also expect to see "The Shield's" CCH Pounder as a San Joaquin County District Attorney who runs up against the area's violent bikers; "Deadwod's" Kim Dickens as an ambitious madame who encounters Jax and Nero as a result of her work, and "Beauty and the Beast's" Bridget Regan in an unspecified role. The new season will also feature the returns of Drea De Matteo, Donal Logue and Jimmy Smits.
"Sons of Anarchy" returns to FX in September.
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