Here a DIY to fix the broken stepper motors from an E34 owner in Japan, a metal bracket http://dd.jpn.org/BMW_HP/20050329/index.shtml
the 2 types of stepper motors used http://dd.jpn.org/BMW_HP/20050328/index.shtml
dash removal and installation of enforcement bracket http://alpinakozou.web.fc2.com/index.html
http://alpinakozou.web.fc2.com/file/.../20090503.html