Salmon smoker is right on the money. You don't have to make this more complicated than it is. I went to a appliance repair shop and asked politely if they could help me with some materials for my project. They pointed me at a oven/range that was in amazing condition and said "help yourself".
I got a high temp light assy, a convection fan and motor, all the high temp wiring I could ever need, some high temp insulation batting and a handy rack for $25.
The wiring you are after has a fibrous/fabric type insulation sheath and is found under the stove top in close proximity to the elements. The wiring behind the range assy and in the control panel has a plastic type insulation and is NOT what you want to use. You will probably find that the high temp stuff even has the correct ring terminal on one end so it's best to undo it properly rather than just go in with side cutters and cut it out. Either way will work though. If the shops wont help you there must be an appliance recycling yard or dump you could visit.
All you need to find is an old range. Look in the classifieds for a free one if you have to. All you need is 12" of wire.