the one that came on my bronco is a flexalite unit that has that brass part that goes in the radiator hose like eric mentioned, and mine doesnt have a temp switch just a control that i chose how much and fast it should be running or not at all. I think mine is like a 15 inch or 16 inchdoes fine all winter long but under serious mud and sand it wants to get hot during the summer, but that is just because the radiator in my bronco is not the stock one and isnt big enough to cool the 460. you should be fine with the 15-16 inch in your jeep landon. just my .02