Your Kenmore top-freezer refrigerator has a capacity of 18 cu ft.
Here are all current 18 cu ft Kenmore models: sears.com/search=Kenmore%2018%20cu%20ft?searsTab=true&excludeMarketplace=true
All top-freezer refrigerators: sears.com/appliances-refrigerators-top-freezer-refrigerators/b-1020313?searsTab=true&excludeMarketplace=true
In the left hand column of search results, you can select Yes or No for ice makers so that you'll only see search results for models with or without an ice maker depending on what you are looking for. If you want an ice maker, it's much cheaper to buy a Kenmore model with the ice maker already installed.
Hope this helps!