The Temperature +/- Switch Bulbs are Part No.
JWH100070
They come complete, as shown below -
You probably could change just the bulb in the carrier, but the bulb will need long-ish wire tails, as they have to wrap around the terminals on the carrier.
The bulb is clear, the Green bit is a little rubber 'condom'
The easiest way to remove the Climate Control Unit is to remove the Ash Tray and Coin Tray, undo the screws that retain the Cup-Holder and remove it.
Then you can reach up the sides of the Climate Control Unit and press-in the spring clips that hold it into the dash, pull the unit forward and un-plug it from the loom.
To get at the bulbs you have to undo the screws to take the back off of the unit and un-plug the ribbon cable inside to separate the back from the front.
I replaced all of the bulbs in there while I had it out of the vehicle and taken apart.
The other bulbs are -
JWH100060
and -
8510251
I can't remember how many of each of these are used
.
