A filler bracket assembly for closing gaps in new or existing sneeze guard assemblies is disclosed. The filler bracket assembly includes dual housings which fit together to provide a cylindrical housing central aperture having an internal diameter sized to receive and affix to a sneeze guard elongated support member. A cap portion is sized to fit on top of the slotted cylindrical housing, and together with gaskets and the filler sneeze guard panel, be affixed thereto by at least one fastener. The split cylindrical housing components allow for easy retro-fit adaptation of a filler bracket assembly to existing, installed sneeze guard assemblies.