1991 Convertible Top Frame Question

So I need a gasket that attaches to a piece of the top frame. It's the channel that runs vertically along the rear of the quarter window. I'm not sure exactly what that piece is called. It's removable with 2 bolts attaching it to the frame . The gasket piece is riveted to the unnamed piece.

I've attached a picture for reference. The gasket is at the base of that piece.

Thanks in advance

Its part# 296a01...Google search turns up empty handed or some web page in Russian