360 ROL mod. Two colors?

[Mikeyman64]

I have semi-recently modded my 360 with 4 yellow lights in place of the green/red lights that were there with 2-contact 603 leds to take the place of the previously green side of the old leds. It's been fine, and it looks pretty cool, but it left me wondering if I could mod it so that the previously red side of the old leds could be changed since right now they don't have a light at all.
I have just added four blue 603s next to the yelow ones so that they share the same ground contact but they each get their own positive contact, just like the old leds, but they won't light up.

llama.com said something about adding a jumper in order to ad the second color, but I'm not quite sure what they meant by that.

Does anyone know how to do this that can send me down the correct path?

[LoyalistRevolt]

I think they mean jumper as in a kind of switch so the system can tell them apart.