You probably saved that range from certain destruction in the flooding and storm surge in south Texas. I, along with the AW.org community, hope you are safe in the storm.
When you nest the deeper part of the Radiant Wall Broiler Pan into the shallower water pan, the entire pan will fit in that little garage under the companion oven. The purpose of the pan's construction was to confine broiling splatters to the pan instead of having them fly all over the oven which was more important before self-cleaning ovens.