well the stock light is the same as the 02/03 R1 taillight,
"Clear Alternatives" makes an integrated taillight / stop / turn signal replacement, which i happened to find on c-list for $30 (new they're over $100?)
i chopped up my stock fender and mounted the CA taillight in it's place:
it's nice because it's way brighter than the other replacement LED light, the turn signals are very noticable. plus, they don't break off!
it took some massaging and fabricating a little license plate holder.