Hole in Bake Tube Kenmore oven....

Question

My oven refused to turn on, I went to change the igniter (broiler worked fine) and after removing the bake igniter, noticed that it had arced a large hole in the bake tube. Can you tell me how hard it is to change out this bake tube and how to do it. I found the bolt inside the oven near the front, what secures it at the back, is it just the two bolts that it looks like I can access from under the oven, or is their some kind of gasket/seal?

thanks, model number is
362.75481891
.