Jon, these are not ash tray surrounds. Those are 1964 Rear License guard Escutcheons. They are the side piece that holds the license plate lights. The ones with part # 148 1146 are the LH, 148 1147 is the RH.
Looking at a complete 1964 license guard assembly from the rear in picture below, they are the pieces pointed to by the green arrows.
Thanks Jason. I had these items in the trunk when i bought vehicle. Someone labeled them. Thanks for your vast knowledge. Jon