Tapatalk is being removed immediately. There are security issues and there is no justification for having it anymore. I apolgize to those die-hard Tapatalk users but you'll need to start using the forums mobile version instead.
Model specific body and interior parts are not going to be easy to find. Mechanical parts is easier.
Join the BMW V8 Club, get their quarterly magazine, members advertise and so do commercial parts dealers. http://www.bmw-v8-club.de