if you go to kiausaparts.com you can look up the part number and bring it to your kia dealer. I did a search but i'm not exactly sure which part you're talking about. The link below might work and it might not. (could be session sensitive.)
Click this line.
Part # 0K018 63361E is described as striker-back door and is the metal hook part. and shows at $5.45
Click this line.
Part # 0K018 63361E is described as striker-back door and is the metal hook part. and shows at $5.45