Those bars are here:
http://www.superbrightleds.com/
Follow the LED links to the 'light bars' -judging by the size of the VXs' brake light 'hole', you should only need one full bar per side.
There's also a ton of LED info on that site. Worth bookmarking, it has calculators and links to other LED conversion projects.
The Luxeons are actually common, though under different names on vehicles -I've taken apart an FXs tailight just to see how it was put together.
They are referred to as "high flux LEDs" in most places. The Luxeon Stars are just the brightest and best quality units that I have heard of.
Personally, I use good old high-intensity (normal) LEDs for most of my lighting applications, due to their wide (45* +) viewing angles.
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