It's the classic Kontrolle style delrin/aluminum eccentric front control arm bushing available at Motorsport Auto, Victoria British and others (not Z Therapy). What I don't like about them is they bind the suspension since they work on a single axis of rotation and the Z's front control arm needs 2 axes of rotation. Usually these don't have enough offset in them either, we always ended up bending the struts. Also, the manufacturing tolerances between the lower control arm mounting holes in the front crossmember is big- I've seen up to 1/2 inch difference in the spacing, so naturally you want to pick the one with the biggest distance between mounting holes if you have a collection to choose from.
On a Hoosier radial you need upwards of 3-1/2 degrees of negative camber in the front. And dial in a smidgeon of toe out for the slow corners.
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katman
