This is a set of shrouds for a single "Holo Projector" commonly seen on Astromechs, scrubbers and even MSE droids. Originally from a Vickers Viscount aircraft, this replicated found part will look amazing on your next build.
Note, these are slightly oversized to allow for the addition of a felt furniture pad or similar to give the holo resistance.
The last picture is an example of what it looks like with lighting from the rear.
