Thanks ,the beam is narrowed 25 mm each side .when I rebuilt the car some 15 years ago I had some American eagle wide 5 porsche style wheels but with standard disc brakes and adapters .i only narrowed it to bring the track to standard width.I then fitted brakes from a 944 and genuine flat six Fuchs which has made the track narrower than standard by about 40mm.
I like the look but the handling took some time to get right.