I removed them on both my boxsters and they do not need the O2 socket (though I have several) 7/8 wrench is all I needed.
I bought some cheap $50 ones from Ebay and they suck big time. I think they are wired wrong.
I then bought some Bosch ones that I had to reuse the original connector. I had absolutely no problems with those, wiring or re plugging them in.
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