Kenmore 465 Stove / Range with range missing a pipe and insulation exposed?
I'm unsure how to proceed

First find the make and model number of the range.
Next, Use the internet to search for the make and model of the range to see if you can find a service manual or user manual in order to see if there is a diagram of the parts. If you can find the name of the part then you will be able to search the internet for an appliance parts web store.
If there is an experienced appliance repair shop in your area they may be able to tell you the name of the part or even order it for you if you can give them the make and model of the range.