What FHP equipment went here?

[FHP0827]

I'm starting to look over 1396 and try to figure out what went where. The Main bracket looks like it was the standard L setup. I'm trying to decipher the console side (about 11 holes, with one being larger and apparently corresponding with a large one through the carpet just below the console), and especially the hole pattern on the passenger side of the top of the dash. That one was apparently a three hole setup, with one upper and two lower. The upper one apparently necessitated removing the pony emblem and drilling right in the middle of the tab holes from it. The two lower holes have "U" shaped footprints, with the open ends of both pointing toward the drivers side. I've never seen anything of the sort there in any of the available in-service pics. I know the siren bracket will go right in the middle of the 11 console holes, but the other ones need to be id'd. I figure maybe the convertacom switch was in there somewhere but not sure of the bolt pattern of it.