Question about standard tire sizes for 2013 650xi?

[Walt White Coupe]

So I just bought a used 2013 650xi and it has what are described as 351M style M sport 19 inch wheels. Everything I've read is that the proper tires for this car are 245/40 for front and 275/35 for the rear. But I look on the jamb and it says the tires should be 245/40 front and rear and that's what was on the car when I bought it. The car has the M Sport Option. So can someone tell me what going on here? Thanks in advance.
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[Walt White Coupe]

So I posted this question on another BMW forum and got the following response:

To my knowledge these were the three most popular wheel/tire options from the factory:

-19 inch 'square' setup with all wheels/tires same width/size
-19 inch staggered with wider wheels/tires in rear
- 20 inch staggered setup

So it seems that my car had the square setup from the factory based on the door jamb information.