http://www.superbrightleds.com/
i have not ordered yet from here but I will some day. I bought all my LED's on ebay, and they are very hit and miss. I went through 4 panels olf Dome light LED arrays (36 SMT led boards) finally i have 2 working ones for a few months now (but one has 3 dead LED's)
My dash lights were blue but gave very low output due to bad choice in resistors, they also had a very short lifespan
as for yellow fogs, I dont know if LED would be very functional on those, but it would look awesome. I LOVE my yellow fogs, their my daytime lights (did the fog light mod) its nice not having to use my headlights all the time.