The math would suggest you do, but it's best to verify.

My understanding is that is you have 3rd row seats you certainly have self levelling suspensions.

However they were also available as a stand alone option.

If you go here -> http://www.bmwarchive.org/vin/bmw-vin-decoder.html
You can input the last 7 digits of your VIN and it will tell you all the options you have.

Obviously you can also crawl under the rear and see if you have springs or airbags...

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