Side panel name on F22?

[Xantho]

I looking at buying a salvage 2 series that got side swiped but I don't know what the panel right behind the door would be called, if anyone knows what this is please tell me it would be very helpful in my efforts to restore a nice car.

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Don't know if this matters but it's a 2015 M235i

[BimmerBreaker]

If its the panel immediately behind the door (same panel above the rear wheel) then this is part of the monocoque - integral to the chassis. It is not a bolt-off part and is extremely expensive to fix. RealOEM will list it under bodywork.