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I did mine just a few months ago. Mine is an '03 S (US version).
There were NO studs, splined or otherwise. All 6 were bolts with nuts. At least one of the nuts on each side was "captive", meaning it was welded to the flange. It was NOT in a carrier of any sort. I say at least one on each side because as bad as the rust situation was, I didn't bother trying to un-thread anything: I got the torch out and simply cut them all off the back of the flange.
It sounds like the fasteners at this location must've been a changing item.
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