Ok so I've been searching and people have no FKN clue what they are talking about. The entire climate control for a 99-00 Civic does INDEED have 5 bulbs. I attached a photo. There are 2 4MM neo wedge bulbs on the A/C, Defrost, Recycle. These bulbs are a little bit longer and they need to go deeper into the plastic housing to show illumination. Next there are 2 5MM neo wedge bulbs in the climate control ***** that control your air temperature, fan speed, and direction air will blow. And lastly there is a 3MM bulb that goes into the hazard lights. Now just for ***** and giggles there is 2 3MM bulbs that go into your cruise control. One bulb is to light it up at night the other bulb makes the cruise control ON light GREEN. I ordered 5 bulbs for my climate control from superbrightleds.com Here is a link
I ordered 2 5mm bulbs 2 4mm bulbs and 1 3mm bulb. Also here is a picture of the attached climate control and where the bulbs are. Thank you finally there is a post and I can finally help someone out!