Lucas style tail lights often look pretty good as they are a lot smaller than the original. Add some smaller turn signals and trim the fender and you can really clean up the whole look of the back of the bike. Be very conservative with how much you trim the fender. It may look cool being short, but it is a real drag to get your back side soaked just because the road is wet. You can plan on the license plate doing some of the fender duty, but much shorter than stock starts to have big consequences. Here is a Lucas light, small turn signals(you can go a LOT smaller) and a trimmed fender for reference. You could get away with a shorter fender, but you also have to consider the angle of the light. Make the fender too short, and the light will tilt up at an angle and look amateur.