Had a similar crack on my '09. Took it to an recommended auto upholster, he showed me how it's cracked all along the side but not split or visible and recommended recovering the whole side bolster for $250-$300. (And he had the material in stock because he said he does a lot of BMWs). He said repair would be $125 but the crack will come back in areas above and below the repair. I decided to just get the repair and I'm a little more conscious now getting in and out of the car.
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