Any slick tire in a 26-inch "decimal" as opposed to 'fraction' sized pattern will fit fine. There are three different 26" sizes out there-- mountain, English, and Schwinn. You have the mountain 26, and those tires are sized in a decimal format. You'll be well-served by something like the Kenda K838.

Please, for your safety and the safety of others, get rid of that abortion of a fork ASAP. get a "suspension-corrected fork" like the Surly 1x1 or the Salsa CroMoto. You'll be about two and a half pounds lighter and worlds happier.