Here's some useful and some entertaining links for you and your SR:

    Kedo  Performance Products.......German company with loads of parts

VD Classic.......French site with lots of goodies for you SR

Thumper Stuff.......American site with a nice collection of parts

SR cafe racers.......German site with sr's (scroll down the site)

Yamaha SR-club of Sweden

The SR500 Club of Australia

Brat Style.......SR's built in Japan......brat style

Ron Sutton's technical SR page

Thumper Page.......good source 

Vanem.......super nice SR parts.......cool webdesign

Yamaha SR 500 FAQ

Sudco.......general parts dealer, USA

SR 500 Service Manual

http://www.redzporvida.com/....eruopean supplier of Daytona parts

http://frid.mono.net/.....Danish SR-site 

http://www.wrenchmonkees.com/......danish custom bike builders