Beads on Browning Superposed

I used to do a lot of trap shooting but have not done so in over 30 years. The last time I shot I lost the middle bead on my Browning Diana Broadway trap gun. The large one on the end is ivory but I cannot recall what the one that was lost was. I intend on replacing it but want to get the correct one. I notice Midway sells them in various colors and materials, including ivory.

Can someone tell me whether the halfway bead should be a gold, ivory, or silver in color. Thanks in advance.