Thanks Ov!
I probably should have posted it at the beginning, but the exploded diagram of the pbrake assembly (all 960 / v90 / s90 *with* multilink suspension) can be found
HERE.
HOWEVER, my car does not seem to have the brackets referred to as #25 on that diagram. Their function is served by the actual aluminium sub-assembly itself; the cable runs right through it, as those last two photos show. So I'm not sure whether Volvo didn't bother doing a separate diagram to show all variations, or... Here's hoping that the parts are correct, anyway.