According to my information the sensors might physically be the same but the calibration may be different, if you look
here on our site you will find the Bosch X5 M62 4.4 Air Mass Sensor. If you note the application guide it does not apply to any Mercedes Benz vehicles, our application guides follow manufactures guide lines.
A for your air box, we have the stock air box for the M62 found in the X5 available
here. With cost in mind you might want to look at an aftermarket intake system such as an
aFe intake system.
Let me know if I can help you further,
ECS Tuning