What finally happened on this thread. The door gasket seems ok on my 1971 Hadco Fridge
, but the ice cube box gasket on it is dry and cracked. Sounds similar to yours.
You used to be able to buy misc gaskets by the foot, but that doesnt happen anymore. Finally I talked to a repair guy and asked if an adhesive foam weatherstripping would work. He told me yes, and added that he restored a 1920's fridge
about 15 years ago, couldnt find a gasket, used a black foam (thanks donna) and fifteen years later its still working great.