RX8driver

I just noticed that the cover for the read seatbelt strap (passenger rear) side is missing! I don't know if it's always been gone or if it some how worked loose and feel off somewhere. This is the black round cover that fits over the bolt that holds the rear passenger seatbelt in up near the side towards the rear part of the ceiling. I tried to take the other one off behind the drivers seat, but it didn't seem to come off easy making me wonder if the other one was even ever there??
Anyone else seen this?