The individual camber adjusters replace the stock camber links on the rear control arms of the car. They're good when used with stock bushings (because of the slop) or spherical bearings, but if you're thinking of using polyurethane or some other stiffer bushings (delrin, UHMW, etc.), then you can't adjust a large armount with the individual adjusters, at the risk of suspension binding.
Actually both adjusters work, by altering the angle of the suspension, which leads to the side effect of a lot of bushing twisting. The individual adjusters will twist the control arm bushing, while the center link will twist the subframe bushings.
The best thing to do, IMHO, is to get both the center adjuster link (I wouldn't get the racing beat, if I remember correctly, you have to take the link off the car, adjust it then put it back on. I'd look at Mazdatrix's link instead.) and the individual adjusters. (I don't know much about Rotorsports, if they're reselling the AWR links, then I'd get the Mazdatrix links since they are modified AWR links with zirc fittings for street use)
You would then use the center adjust link to remove the majority of your negative rear camber and then use the individual adjusters to fine-tune your camber. That way, you could run a car with stiffer bushings, proper camber specs and a low risk of binding. Just make sure you use stock subframe bushings.
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