Five-0 light mount wanted
 

I'm looking for the mounting kit for a Five-0 light, or a diagram/photo of one so I can mount the light to the right of the rear view mirror in my 1989 Minnesota State Patrol Mustang SSP. I have been told by the original installer that the mount is round with 2 tabs with screw holes coming off the front with a center screw hole to mount it to the light with the light's top screw. Any help would be greatly appreciated,
Bob