There are two basic styles... The RCC setup that Stuart has pictured, and the Held setup that Dave has pictured.
www.rccspecialty.com www.heldmotorsports.com Having absolutely no experience with either, here's my take...
I like Held upper mounts because they bolt in place. The Held upper arms should be used with Held upper mounts because they were designed to go together.
I like the RCC lower arms because they are adjustable for caster and the Held lower arms are not.
Dave: You didn't have anything to do with the original design of your lowering knuckles, did you? I've been wondering for a long time about the use of Fiero rear bearings with a welded bolt in them. Surely GM has a suitable non-drive-axle 5x100 hub that could have been used instead?
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'87 Fiero GT: Northstar, Getrag, TGP wheels, rear sway bar, rod end links, bushings, etc.
'90 Pontiac 6000 SE AWD: Leaking ABS unit fixed, load levelling rear suspension fixed, still slow