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The xc90 calipers' pipe attachment is actually slightly closer to the body than the standard one so your current lines will do fine.

336s fit under Tethys without spacers iirc.

Should fit, I know for a fact they go under 17" amaltheas, comets and pegs. There's about 15mm gap between the caliper and wheel weights with amaltheas.

I have seen this setup behind a set of 17" Tethys......not sure whether they were using spacers tbh.

When I first bought my S60 it was wearing a set of standard 286mm discs which looked a bit worse for wear, first job was to replace these with 305mm discs using the original callipers but new...