Abstract: An adjustable head restraint assembly and method for enabling a head restraint pad (18) to be adjustably and lockably positioned with respect to a motor vehicle seatback (14) so that the head restraint pad remains in an adjusted position during a crash sequence after being set by a user. Associated with the head restraint pad (18) is a pair of posts (20). A tubular bushing subassembly (22) is mounted within the seatback (14). It has an inside bore (54) sized for receiving one of the at least one posts (20). The tubular bushing subassembly (22) has an upper separable portion (26a) with a customizable head (36), and a universal lower portion (26b).