I am eventually going to do the same myself. Though I have seen some Ninja’s around when I ride… those things have very little lighting to be noticed for sure…. for my 9 I am going with the conversion to get the turn signals to be multifunctions also. 3 red lights are better then one. you can try this site:
http://www.bikerhiway.com/electropods-flashing-led-motorcycle-brake-lights-red-leds-p-336.html
Their not custom but really add ons. If you do a search for sport bikes in particular you may find some that are made for your bike specifically. I am finding most are for cruisers though. I haven’t really looked into it a whole lot as for right now I already need to replace a tire, looking to get the front pulley and needing a new summer jacket.
Another good one I see:
http://www.motorcyclelighting.com/