Spidertrax spacers add 1.5" on each wheel to your axle width.
I decided to add wheel spacers for two reasons. The first is to make my stance wider to help avoid roll overs since I have a 6" lift. I alomst rolled my old TJ a couple different times and I don't ever want to experience that in a jeep this expensive. The second was to move my wheels out from my lift kit. The rear sway bar end links have bolts that come too close to the tires for my taste. Also, the bolt was scraping my frame at full stuff, so by moving the end link to the outside of the sway bar I gain some clearance from the frame.
The spacers are easy to install. I took it out for a test drive and it drives like normal.
I found one of the pairs on Spidertrax's website on the "outlet" page. That's why the color of the two are different. You don't ever see these unless the wheel is off, so I'll take the discount!