Remove the front seat belt retractor.
(Refer to Front Seat Belt - "Front Seat Belt Retractor")
Loosen the mounting bolts, remove the height adjust (A).
Tightening torque :
39.2 - 53.9 N.m (4.0 - 5.5 kgf.m, 28.8 - 39.8 lb-ft)
To install, reverse the removal procedure.