Yes center bore is 57.1mm as the hub is 57mm
I would recommend you get wheels that fit correctly and don't use the hubcentric rings. I have noticed that over time they go out of round and cause balance issues. i know others have never had problems with them but imho if it's not the right size to start with it's not he right wheel for the car.
1987 2.7l e30 m20b27 supercharging
1991 3.5l e30 m30b35 it is dead so sad
1985 3.5l e23 m30b35