I just bought me an 87' W250 w/360 mated to the 435. My heater AC controls were not working and after pulling the head unit I've discovered someone has removed the vacuum plug that goes into the back of the head unit. Why? I don't know. I have searched and searched but I cannot find one online. Does anyone have a clue where I can get one?

 

Nobody makes it. I just went through this. You have to take the ends of each vac line and use shrink wrap. Like for wiring and reconnect the hoses to each other. yes it is a pain. Chances are if you do find one in a salvage yard it will be rotted and fall apart in your hand.