windsorcube

yes Ford does make a rubber plug that goes in the back If you need park brake shoes the they also come as a kit with the shoes including the springs

the setup you have is drum hat the park brake shoes are located in the hub of the rear rotors you may not see the rubber plug the factory stamps a hole cutout on the backing plate this needs to be knoked out before you can see the brake adjuster, the adjuster needs to be backed off before you can get the rotor off most likely you will need rear park brake shoes they fall apart or come off the shoe backing very common concern on these units I am a tech at a Ford dealer have done numerous ones good luck