What bus?

I hope I can get some help from You in here.
I want to go to คำตากล้า this sunday, 15th. I want to take a night bus, arriving in คำตากล้า in the morning. I´ve done this trip several times, but then always in company with my wife. So I really don't know what line to take. I found out that I can take a bus to บ้านแพง but I don't know if that one stops in คำตากล้า. I would appreachiate if You could help me with bus number/line number and what counter to go to in Morchit.

I hope some of you speaks english and are able to help me. I am in a bit of "stress" as I am going soon!

You can answer here or email me rallyloppan@hotmail.com