The Terrafirma wheel spacers are easy to install, simply bolt them to the original studs and the wheel bolts to the new studs on the spacer. They have definitely improved steering, handling, stability and they also look good as well. By adjusting the lock stop nuts the steering lock has also significantly improved.
Terrafirma Wheel Spacers are milled from a solid aluminium billet and feature a spigot ring to help centre the wheel when fitting. They may be expensive, but they are worth it.