Thanks Don. Will follow those tips.
I did a little exploration and believe I can see the speaker about where the diagram showed it should be in the left rear corner.
You can see some of the adhesive used to tack it down ran a bit over the edge of the headliner. Speaker is black.
A bit hard to capture a pic while but visually it's a bit clearer since you can angle your sight just right.
Will provide an update when available.
Thanks again!