Vintage refrigerator seals or gaskets are available from online restoration firms, such as Store.AntiqueAppliances.com. Depending on the year and model, it may be possible to take a piece of the old seal to a local hardware store and find a compatible replacement.
Models from the 1940s and 1950s have specialized seals with compression gaskets, made up of two conjoined sections. The bottom section, the lip, fits underneath the interior door liners, while the dome-shaped piece sits on top of the sides and bottom of the doors. The dome-shaped piece flattens when the door is closed, providing the seal. Several varieties are available, usually sold by the foot.