There is a guy selling duckbills on evilbay. He states that mark 1 only had 1 duckbill on the end of that drain under the heater core. He also states a 1A & 2 had 3, the centre one and 1 each side to drain the fresh air vents. Now my big restore is a 1 and it has 3 duckbills. Even if it does not have the fresh air vents, it would still need drains for the vent openings?