Wheel Spacer ? How much Difference?

[H2zona]

Good day folks,

I have a question that I have been searching and searching and just can not find a thread out there with this info.

I have noticed that the front and rear wheel width is different. It seems to be the same as like Chevy and GMC trucks. When ever I lifted or added wider wheels the fronts always stuck out more. My last truck I had an avalanche and was running a 20X12 wheel and I ended up running a 1" wheel spacer on the back to even out the look to the front.

My question is can anyone tell me what the difference is on a the HUMMER H2.
The spacers I have been seeing are 2" but can also find 1.5". Since I have to order these I want to be able to order the correct size the first time so I can even out my stance.

I would really appreciate any help on this topic.