Those are 1206, and I think Pololu used 0603 (1/4 the size). Unless you have done SMD soldering, and you are comfortable with that size, I recommend you use the more standard (among beginners anyhow) through hole type of resistor.
Those two should be the only ones that need to be replaced.
I do have a bit of a concern though, in that 82k pullups might be too weak for the sensor. If the sensor will only work with pullups that are too strong for the NXT, then you'll need to use an I2C bus repeater (or modify the NXT like Aswin did). For now though, replacing the pullups is definitely the first step (since it doesn't take much time or money, and is likely to work).
I would remove the 4k7 resistors (the two that need to be removed), and then solder some axial resistors to the header.
Since you shouldn't need a breadboard between the NXT and the IMU, you could probably just use half an NXT cable, and solder the wires directly to the IMU header.
I'm all for gun control... that's why I use both hands when shooting