This kit includes two idler pulleys. One pulley replaces Sears 134194, and one replaces Sears 173437. Two 21" blades replace Sears number 134149. Two complete spindle assemblies, replace Sears 130794. And one deck belt replaces Sears 144959. Belt specs: 95-1/2" x 1/2". Fits Craftsman 42" mower.