What do these numbers mean?

Im trying to buy led lights to mod my xbox 360 controller, like this, a href="http://www.youtube.com/watch?v=9Aqc6OZkm60&feature=related" rel="nofollow"http://www.youtube.com/watch?v=9Aqc6OZkm…/a . Just the ring of light in the middle. Ive found a seller on ebay selling an 80 pc set of LEDs but some of them are not 0603 LEDs, which i believe refers to the size of the led, but im not sure. some of the lights he is selling are called as 5050 leds. this is his ad, a href="http://cgi.ebay.com/0603-Ultra-Bright-8-Color-SMD-LED-PKG-80-pcs_W0QQitemZ200379023674QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea785413a" rel="nofollow"http://cgi.ebay.com/0603-Ultra-Bright-8-…/a . if you could give me some info about what lights i need for this mod id be eternally grateful. Thanks