First wanted to say: Just used the Comet Sunlight bulbs for the first time and I am hooked with the look of them. They are in between Warm white and cool white. All my Classic games will have the Sunlight bulbs installed in them when I switch to leds.
Second: Just installed Comet 555's on a Eight Ball Deluxe. Had the same problem with the sides of the base being too square/thick to go in easily. Resolved issue by using a small file and hit the side edges a little to give it a little angle. Yeah it's kind of a pain but it worked.