Here we have a set of 2 1955-1956 Chrysler 300 Imperial Dodge Plymouth Interior C-Pillar dome lights with the Imperial Crown logo.  One plastic mounting tang is broken off, as shown in picture 8, was still holding on fine with the other 3 intact.  All four intact on the second one.  

These lights are untested.  Approximately 4-1/2” diameter. Nice vintage set. All pictured included. See pics. 

GM33245