Abstract: The invention comprises a universal lockable mount to retain a Citizens Band radio or other accessory to the underside of a vehicle dashboard or to a vehicle accessory hump mount. Upper and lower portions of the mount slide together to form a box enclosing fasteners and thereby preventing access to the fasteners without first unlocking a padlock or other locking means and sliding apart the upper and lower portions. The lower portion includes depending covers to prevent access to conventional fasteners at the sides of the accessory and the accessory support bracket. The mount includes adjustable means to accommodate accessories of differing width and to permit the accessory to be adjusted to an angular position relative to the dashboard or hump mount of the vehicle.