whilst they do work well, every report I have seen indicates rapidly increased tyre wear.
(due to permanent straight ahead neg camber)
they are the original arms cut and welded with a spacer piece
A better solution would be the WALKit which achieves a similar effect in a different way, but also leaves you open to add adj top mounts (to add -ve camber) at a later date.
I would err away from them.
check out tony danzas link in the
WALKit review which explains it better