I found an awsome website that has some cool accessories. the most I've seen on one website anyway. some are generic for any bike but there's quite a bit just for the GS500. :thumb:
http://www.whaccessories.com/GS500Accessories.htm
That is a cool UK based website and some members have bought stuff from them. They're listed in our vendors thread. you should check it out for more websites.
http://www.gstwins.com/forum/viewtopic.php?t=2125