Line two large baking sheets with parchment paper.
Combine the oats, wheat germ (if using,) oat bran, almonds, pecans, and walnuts in a large bowl. Stir together the salt, brown sugar, maple syrup, honey, and cinnamon in a saucepan. Bring to a boil over medium heat. Add vanilla extract, then pour over the dry ingredients, and stir to coat. Spread the mixture out evenly on the baking sheets.
Bake in the preheated oven until crispy and toasted, about 15 minutes.
Add sunflower seeds and stir the mixture and bake 10 more minutes or less, depending on your oven. Watch carefully not to burn the edges or the bottom. Sugar burns faster than other ingredients.
Cool, then stir in the raisins or cranberries before storing in an airtight container.