You don't need a spacer, it bolts right on. It works too. Search, this has been discussed a million times over.
My jeep has only ever killed 3 things, a cat, a deer, and my wallet. What's the problem officer?
1992 Red YJ. Lifted, locked, and loaded with beer (Disclaimer: This doesn't mean said driver endorses drinking and driving, please enjoy alcohol responsibly and do not operate any vehicle of any kind, thank you....)
Thanks to the price of gas here ($4.25 a gal) I just bought a mountain bike, 0" of lift, 0" of travel, MT's, locked rear axle, oh yeah, it's the sh#$.