I had the same question, and the ones below were suggested to me. But I have not bought any yet. This was supposed to be quoted text, but did not quite work -
The most common, a clear or frosted 5050:
http://www.cometpinball.com/product-p/1smd5050.htm
Next, has been a favorite of those that have tried...6 LED Crystal Fan...
It lights upward and downward at a 45 degree angle.
http://www.cometpinball.com/product-p/6smdfan.htm
and more recently, if in your taste, LED Bumper rings:
http://www.cometpinball.com/product-p/bmpring.htm