Guide for seat belt webbing having a deformable insert

A guide ( 34 a) for seat belt webbing ( 16 ) in a vehicle ( 14 ) includes a support member ( 50 ) that includes an elongated slot ( 88 ) through which the seat belt webbing ( 16 ) extends. A curved surface ( 90 ) defines a portion of the elongated slot ( 88 ). The guide ( 34 a) also includes an insert ( 110 ) that is adapted to be received in the elongated slot ( 88 ) of the support member ( 50 ) and that includes a webbing guide portion ( 112 ) for guiding the seat belt webbing ( 16 ) through the elongated slot ( 88 ). The webbing guide portion ( 112 ), during normal operating conditions, is spaced apart from the curved surface ( 90 ) of the support member ( 50 ). The webbing guide portion ( 112 ) of the insert ( 110 ), when subjected to a load from the seat belt webbing ( 16 ) that exceeds a predetermined amount, moves into engagement with and conforms to the curved surface ( 90 ) of the support member ( 50 ).