Here is a link to the Ifixit guide on how to remove the centre dash in a 1998 Honda Accord. It is handy as it will give you access the the climate control lamps.
1998 Honda Accord Center Dash Disassembly
Here is a link to a video which describes how to remove the centre dash and then locate, remove, identify and replace the lamps, be aware of the polarity when reinstalling.
In the video it mentions that one lamp is a LED T5 and the others are T4.2.
Here are some links that show suppliers of the LEDs. It is not a recommendation to use them, it is shown to give an idea of what they look like and their cost. There are other suppliers online that may suit you better
Hopefully this is of some help.