The velocity stacks are on the Honda Direct Line website if we are speaking about the same ones (ADD ON, Carb Stacks for the Valkyrie (set of 6) chrome - SKU #: ADD-459011. (200,00 US)
https://www.directlineparts.com/product.asp?pid=1484&str=2&ID=009872999I ordered a set back in Jan however they are still on backorder. Called them Friday and it will be another month at least before in arrive from Japan.
I am looking at doing the the same thing you described with the LED's:
http://www.youtube.com/watch?v=DQvfvylEum8&feature=relatedSteve