These guys have the Powerbronze undertails and other stuff. I have bought from them and they are great.
Superbike
I was going to post a pic of it on my bike, but I can't find one. Huh. I'll take some shots later this morning and post 'em.
Anyway, the Powerbronze tail lets you keep the stock oval taillight housing and lens. Though I gutted the bulb carriers to put in ICEMANN's excellent LED lights.