Is there any were, where a person could buy l like after market gascap, in like black, My bike is yellow and thats totaly not my style, and now I've sanded it and now going to paint it jet black...
u could paint it black. black rocks man.
you could always buy a cas cap decal.....
You could check out this site (http://www.pro-bolt-canada.com/acatalog/index.html?http%3A//www.pro-bolt-canada.com/acatalog/Pro_Bolt_Canada_GS500E__1998_2002__328.html&CatalogBody) (third item down). It's not a gas cap exactly, but its kinda close. They come in black, blue, purple, red, gold, green and silver. $11.98 US + shipping for 8 colored bolts.
Personally, I'll just stick to using a sharpie but that's me.