Some info for you.
As you drop the R32, two suspension settings will fall out of alignment at the rear - toe (toe-in, specifically) and camber. There are actually two control arms the rear suspension on each side of the car that can be replaced with adjustable items to deal with this.
A single set of adjustable arms (put in the lower position) will allow you to adjust the camber primarily, and only a little bit of toe (but not independantly of each other) - so you may find that you have more (or less, I can't remember if you gain or lose toe, I just know it goes out of wack) toe than some workshops are happy with - but you won't be able to do much about it for a given camber setting (which is what you really need to deal with primarily).
If you get another set of adjustable arms and use them in the upper position, you can pretty much get any toe and camber that you want (within reason). I probably wouldn't bother with this on a road car though, the amount of toe misalignment that you get with only a single set of arms is fine unless you're trying to tune your chassis for particular traits under race-style conditions.
I've had ECS adjustable arms on my car. They're the cheapest option I could find, they're actually made from OEM arms, but the adjustable bit is right in the middle, where it's most likely to bend (and mine have). The bushings on mine (on the diff end) have also failed, leaving me with a rotten squeak.
Dyldo had the Gruvenparts adjustable arms, but had some issues with them binding and being impossible to adjust.
Bear in mind that Dyldo and I are only single examples of each of the ECS/Gruvenparts user base, and our experiences may or may not be typical. I wouldn't base any decision purely on our experiences.
KW are suspension experts, and I suspect that of the three, they're the stuff I'd get if I were to buy again.
---------- Post added at 07:30 AM ---------- Previous post was at 07:25 AM ----------
Not compatible with the R32 as it wasn't AWD.
There are some R32-specific bits in this listing - if it doesn't state R32 or 4Motion, it won't work on an R32.
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