Warm Morning VR50MA B Propane Heater Question

My Warm Morning Ceramic Brick inserts have been previously repaired with some form of ceramic glue. Some of the inserts have come off their respective shelf/ledge and now rest on the burner.

I would like to access the brick inserts and place them back on their shelf and glue the bricks that may currently have split or otherwise come apart.

Is there a schematic or manual for this and what glue would have been used? (A repairman previously did this service on this stove when my father was owner of this house. I have no notes as to how it was done).

Do you know of any available replacement bricks?