dual filament will work, but it is not required, but if you want to go that route... find any aftermarket 3 wire bolt on, i have an LED short stalk set. you basiclally have +,-, and CLK wires on the signal do a little research or probe around with a multimeter to find the 'running light' on the brake light, (i think its brown? but dont hold me to that.) Wire the - to - the CLK (flash) to the existing turn signal lead. and finally in-line splice the 'running light' wire of the signal to the 'running light' wire of the brake light. Use the Led ones, you can find them anywhere, (motorcyclesuperstore.com has a bunch) dont bother with the lamps, they suck and for signals. Hope this helps! i did this on my ninja, i custom made a liscense plate braket filled with LEDs and wired it thusly.