4 button leds, Digikey Part 67-1606
...
3 or 4 knob leds, Digikey Part 67-1608

It would be even more usefull if you could give the specs on these (diameter, height, connector pitch, electrical parameters), so that those without access to Digikey (or those wanting to order it from a store a little closer) have a chance identifying the parts.

cu,
sven