The LED's behind the gauges on the xD are the PLCC2 size.
http://store.garage1217.com/plcc2-le...-smd-wor2.html
The stock cluster LED's are white and the color of the gauge comes from the face itself. I used a blue colored film that Jeremy sells behind my stock speedo to make it blue and put red film behind the tach to change over the Amber that I hate so much.
It was easy, and works for me until I can find the time to make my own custom face.