27908. 40% SIDE. Inner. outer. PartQualifier: outer. Seat back frame bushing. SEAT BACK-SPLIT BACK. SEDAN. A component which cushions noise, friction or movement for the Seat Back Frame. A cylindrical insert that fits between the Seat Back Frame and another component. A protective sleeve which provides a cushion between the Seat Hinge and it's mounting surface. back inner. back outer. Back Sleeve. Hinge. mount. Included with: Order by description seat back assembly, Seat back assembly.