If you google VEM-V20991274, this BMW on line site sells it.

I have two spare tanks in my garage. It's hot here. If one blows up or cracks, I can replace it quickly. I kept the clutch fan to help it run cooler. With the water pump posted, mine runs at ~194F running around town.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)