Hi there i need help , i got these 2 houses that i dont know where they go . the car is 1988 300zx turbo ..

 

Those are your turbocharger coolant lines, they usually connect somewhere around the throttle body. Don't have a good picture with me but will try and get you one soon. While the coolant lines may not be required, if they are there it can vastly extend your turbochargers life.