installation of backrest frame is only released with seat mechanism! ONLY APPLIES TO CO-DRIVERS SIDE,installation of backrest frame is only released with seat mechanism! ONLY APPLIES TO DRIVER'S SIDE,installation of backrest frame is only released with seat mechanism!,ONLY APPLIES TO CO-DRIVERS SIDE installation of backrest frame is only released with seat mechanism!,ONLY APPLIES TO DRIVER'S SIDE installation of backrest frame is only released with seat mechanism!