Jack, 
On my slide out the stops are positioned where the slide out stops about 2 inches from the door.  The plastic stops are nothing special, they could be replaced with small pieces of wood, different plastic, or nylon.  I believe that they are held in with screws.  Basically like a 1/4 inch keyway key made from plastic.  Also the solenoid on mine is in the front cap not the electrical bay.