There probably out there somewhere,
Ebay sux because they rape you on shipping, and I had one I bought of ebay die on me after only 3 days! Yeah the fucking inverter fried and took my cathode with it, needless to say I was pissed.
I would look in the buy/sell forum, ther'll probably have something for you there, and a good seller that won't screw you on shipping.
I believe the leds your looking for are infact bicolour leds, go to LSdiodes.com
, they're great and i'm pretty sure they have the colour combination Bicolour leds you're looking for.
If you want, you can always hook up two single 3mm colour led's of your choice on each side of the eject button assembly, It'll probably be brighter in the end if thats what you want. The bicolours are nice because if you know what you're doing it's just desolder and swap, but if you feel less confident just cut the prongs and solder a new bicolor to them. (if you suck at desoldering stuff i recoommend this)
You'll want to be sure of the wiring setup for the led sequence you want , I believe, xbox_hackz.com
has a good diagram on their site, but don't hold me to that if not, ask someone.
Hope I was helpfull,
Oh yeah, I think ADPmods.com
might sell the cathodes you're looking fo