Mont. Code § 80-8-210
Any nonresident applying for a license under this chapter to operate in Montana shall file a written power of attorney designating the secretary of state as the agent of such nonresident upon whom service of process may be had in the event of any suit against the nonresident person, and such power of attorney shall be so prepared and in such form as to render effective the jurisdiction of the courts of Montana over such nonresident applicant; provided, however, that any such nonresident who has a duly appointed resident agent upon whom process may be served as provided by law is not required to designate the secretary of state as such agent. The secretary of state shall be allowed such fees as provided by law for designating resident agents. The department shall be furnished with a copy of such designation of the secretary of state or of a resident agent, such copy to be duly certified by the secretary of state.
§ 80-8-210, MCA