The most important thing I can say is that after inspecting and installing a 2" spacer on the back of my 2003 Suburb z71 I trust them when I bring 3 small children in the car. It's real 2" 6061 aluminum - a perfect choice (I wouldn't buy plastic as all plastics lose creep under constant stress). about 1.5 inches longer than OEM. In the font I used Dynofit 3" hub wrenches.
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