I am of the opinion that the fasteners which have the red dye are those which were critical to the safety of the occupants. Also I think we must be careful and know the actual build date of the vehicle being restored. On January 1 of 1968 many new Federal regulations became effective. One such regulation was that certain fasteners were to be checked for proper torque when assembled. Those are the fasteners that were coated with red dye. Obviously this did not magically happen beginning midnight of January 1, 1968. Some regulations called out implementation the new safety standards after existing stock was depleted, while some changes were in reality put into effect before the stated date for the regulation because they had to be in use by January 1. Hubcaps, side marker lights, shoulder belts and even interior door handles were all redesigned to comply with the new Federal laws. In summation, it is important to only have certain details when it is appropriate to the vehicle in question.