I have a Masterbuilt Electric Smoker. Model # 20070106 and my heating unit went out. Can anyone tell me what model number to use to order a 1200 heating element kit from Masterbuilt. Because they said I had to have a model number before I could order the kit. They have several different model numbers and I don;t know which one will work with my own smoker. My smoker has no window doors or 2 doors. So this is why I am not sure which model number for the kit so it will fit in my smoker.