New reproduction American Motors part. These are the rubber seal on the top of the B piller door post. The windlace comes up into these. They fit the four door hardtop cars only (not sedans). 

They will fit the following Nash and AMC cars:

fits

1956 & 1957 Nash Rambler 4 door hardtops including hardtop station wagon.

1957 Rambler Rebel

1958 thru 1960 AMC Rambler 4 door hardtops