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The most important thing is to make sure that the spacers/adapters are 'hubcentric'. Basically meaning that they self center around the hub and don't rely on the lugs to center the spacer. A generic, non-hubcentric spacer can cause vibration that feels like a very out of balance wheel.
Z168, I would also recommend if you are going to make a change over like this, go to say the 6x135 bolt pattern (vice something like the 5x135 pattern) since the 6x135 pattern is going to normally be associated with a wheel that has a larger backspacing/more positive offset. This is going to be beneficial to you since you will be able to play some with the thickness of the hub and the backspacing to maintain the alignment of the hub bearing and the center of the wheel. It is this difference between hub bearing center and wheel center that can cause issues. some difference is manageable, but you start getting too much and you can run into issues.