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Battery will be H5 (Group 47) or H6 (Group 48) - not H6 or H7. Check the existing battery label to know which, or if necessary measure the width.
The battery well will accommodate either size, but the hold down clamp adapter (right side, lower) supplied with your car is sized to fit one of those battery group sizes only. If you want to change from one size to the other, you can buy the correct BMW adapter piece for a few dollars.
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