You can find info about the Beru spark plugs suited to your vehicle at:
http://www.beru.com/english/
I have had no success locating a source for their parts in my community. At the WEB site above I posed such a question and learned the following:
Beru Corp. - USA
Morton Grove, Ill.
847-470-1739
Was also told the best bet for a source in the U. S was at:
Kingsbourne Wire Werks, California
800-673-0375
www.kingsborne.com