Go to kenmore website and give make and model. They should be able to help.
Where To Get A Manual For An Old Kenmore Electric Cooker/fryer, Model 309-69320 Sears Doesn't Keep Them After 20 Years?
Looking for the glass cover id 81/2 " , ed 91/2"
You can google that information and they may be able to lead you to a company or someone that has one......the best to you