From 2007 onwards, there were head restraints for seated passengers in the MT-3 and AT-5. However, it is possible to install the head restraints and the Hyundai Accent in another installation or earlier release year. If the backseat backseat has a head restraint patse, it is not necessary to install them. To do this, you will need to insert the attachments (part numbers: 89720-25300 and 89722-25300) and the head restraints themselves (part number: 89700-25400).