Mont. Code Ann. § 75-10-504

A motor vehicle wrecking facility or graveyard site established or proposed on or after July 1, 1973, may not be approved for use or licensed if the proposed facility cannot be shielded from public view on the date it is initially established or proposed to the department for licensure. The prohibition concerning approval of a new motor vehicle wrecking facility or graveyard site does not apply to a facility site that was licensed as such at any time within the 18 months immediately preceding the date an application is made for licensure of such site.