Am a bit confused re rear discs/rotors. I was under the impression that all 940s had one of 2 types or rear disc/rotor one for multilink suspension of 265mm diameter, and one for standard suspension with a diameter of 281mm.
What I am looking at are a pair of genuine Volvo rear discs with a pattern as of multilink suspension ie actual disc/rotor is in centre of casting but it has a diameter of 281mm. I was expecting the disc/rotor t be on the edge of the casting. I obtained these extremely cheaply and they have Volvo part number 272301-0 or EMB 5927415.
Nowhere can I find reference to my pattern disc/rotor having a diameter of 281mm.

 

If you have Volvo rotors they should be stamped on them.

If not then try to match them up and see if they are the same.