It's been almost 2yrs. since I had the tank out for that mod, but as I remember, they are located on the street side. My fill is in the back. In that pic the tank is sitting on end at the back of the 5er. you can see the fill and vent on the bottom of the pic.
Look underneath where your drain comes out. That should tell you where the rest are.
And, NO. don't pump antifreeze into your tank. You'll never get it out. Like Dale said, there is enough room for expansion so it shouldn't hurt the tank. It hasn't mine.
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