Combine the oats, wheat germ, oat bran, sunflower seeds, almonds, pecans, and walnuts in a large bowl. Stir together the salt, brown sugar, maple syrup, honey, oil, cinnamon, and vanilla in a saucepan. Bring to a boil over medium heat, then pour over the dry ingredients, and stir to coat. Spread the mixture out evenly on the baking sheets.