Goo, I just saw ur question, so I will measure and post a picture in Flickr.i have since found a slight problem,- it wound seem the offset of the disc on the hub is different, and brings the disc very cl0se to the lower ball joint for the steering rack- will it pass IVA and cud the seal melt?cud an e30 builder post a comparitve picture? Thanks
https://m.flickr.com/#/photos/78885582@N04/25666588874/