Heater control lights

I have an '01 GMC Sierra SLT. The lights for the heater buttons (rear defrost, a/c & the other two for air draw) are dropping like flies. First one quit working so I took the panel apart & found them to be small bulbs that are soldered in place, since then two more have burned out. Does anybody know where I can't replacements, or do I have to live with this.... Any help appreciated as always...
CheckEngine :ylsuper:

Oops, meant if & where I can get replacements. Thanks again
CheckEngine :ylsuper: