After market stop light

I’m looking for a small light bar type flashing aux brake light that mounts on the bottom of the license plate. Does anyone know of a good unit that works with a positive ground?

'Found this: http://www.jpcycles.com/product/zz30503 ... gKrefD_BwE
If you ignore the Blue wire for the cheesy Knight Rider running light, you can hook the Black wire to the brake light wire, then run the Red to Earth. Granted, it's not specifically for Positive Earth, but it won't know the difference if hooked up this way.

Nathan