If you are running modern radial tires you should not follow factory alignment specifications for caster, SPC recommends 3˚ of caster to promote return to center steering. Stock strut rods on late 1st generation ('68-'73) Mustangs are non-adjustable and often have worn bushings that can cause unwanted movement of the lower rod assembly and poor handling. A must for early Mustangs, SPC's adjustable caster rods features low durometer OE-style bushings to protect the chassis mount from damage and has easy caster adjustment. These adjustable strut rods will provide the positive caster needed for improved tracking and modern geometry.