Hi Franck, as said several time, unfortunately to my knowledge no alternative for those very particular ATE 340 mm brakes.
Only Bentley .
The french website who will offer them don't know they are special and will finally cancell the order or send the regular rotor which do not fit.
Those cars, specially from 96, are expensive to maintain on some part because some are exclusive Bentley still for the moment.
97 Continental R