It is one name for the rubber seal that is attached to the door opening on the cab: the
"door opening weatherstrip" In your 1953, the upper windlace (door opening weatherstrip) is held in a channel that goes around the opening of the door - except at the floor, at the door opening (see link below, "body sill weatherstrip retainer").
In the lower door opening - at the floor, that lower rubber windlace seal in held down with a metal strip.
lower windlace door opening, upper windlace Here is the metal strip - lower windlace retainer (referred-to in step 11: "body sill weatherstrip retainer")
