The picture you see is of a e90 with power seats. The 330i come standard with power seats, so those are the type you will get with a 330i in the US.
The thigh supports are a manual operation, regardless, and they only come if you get the sport package, either 325i or 330i.
If you assumed that button on the corner of the seat that looks like this: "< >" was the thigh support operation, you are mistaken. That feature controls the side bolsters.
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