High Intensity Stop and Tail Light Bulbs
I have used them for several years on my Concours. The bulbs I bought are sold by "Genuine Custom Chrome Motorcycle Accessories" and they replace the 1034 and 1157 bulbs. Ther are labeled "Double Filament 12 Volt Bulb" with a subtitle of "Hin Intensity Stop and Tail Light." They aren't cheap at about $6 each, but on a bike with a single tail light assembly like the Concours, they greatly increase the rear visibility. BTW, I found mine at the Manassas Harley Davidson dealer :lol:
Also, the label on the back of the package reads, "12-530 EA 'Super Bulb' HIGH INTENSITY TAILLIGHT STOPLIGHT BULB. 12V"
They are much brighter, I hope this helps you...
Cheers,
Chris