What do we call these things?

Division Bar Cushions:
These are the rubber bumpers at the top of the sideglass when the sideglass is in the up position. Located at the end of the vent wing window frame - most are held in with a screw.
A-Body:
GG-157 1963-66 A-body Division bar upper cushion - hardtops $ 26.00 pair
GG-157C 1963-66 A-Body Division bar upper cushions - convertibles $ 26.00 pair