This item is a used rear trim liner rear passenger door panel complete (Leather wrinkled) for a 1999 Acura RL.
The part numbers are 83720-SZ3-A20ZB and 83720SZ3A20ZB.
This OEM Genuine Acura part
sells for $45
and comes with a warranty.
Please note, this is an interior door panel, not an actual car door!