Hy txpete, my name is 3B, there are two different possibilities for rear wheel cylinders for your truck, the standard duty wheel cylinders have a 1 1/2" bore the p/ns are Raybestos WC18196 and WC18197 one of each will be required for each rear wheel they are both available at RockAuto $27.99 each. The heavy duty wheel cylinders have a 1 5/8" bore the p/n is Raybestos WC19107 $25.79 each at RockAuto two required for each rear wheel. If you need front wheel cylinders let us know. There are repair kits available for the rear wheel cylinders but two different types of cups are available, ring type cups (hole in the center) or solid cups so we would have to know what type of cups you require, hope that helps.
