Vehicle seat rear assembly for a vehicle seat, vehicle seat, headrest cushion part, vehicle and method for installing a vehicle seat inside a cabin of a vehicle

A vehicle seat comprising:

• a vehicle seat rear assembly comprising:
• a headrest frame being integrally formed with a back support frame of the vehicle seat, and
• a headrest cushion part,
• wherein the headrest cushion part is movably coupled to the headrest frame when in a release state (RS), and
• wherein the headrest frame and the headrest cushion part each comprise a fixing interface for permanently fixing the headrest cushion part to the headrest frame when in an operational state (OS).

A headrest cushion part for a vehicle seat rear assembly comprising a headrest frame being integrally formed with a back support frame of a vehicle seat, the headrest cushion part comprising:

• a coupling interface for movably coupling the headrest cushion part to the headrest frame, and
• a fixing interface for permanently fixing the headrest cushion part to the headrest frame,
• wherein the headrest cushion part is movably coupled to the headrest frame when in a release state (RS), and
• wherein the the headrest cushion part is permanently fixed to the headrest frame when in an operational state (OS).