SPC Performance 68-73 Ford Mustang Adj. Caster RodsIf you are running modern radial tires you should not follow factory alignment specifications for caster. SPC recommends 3deg of caster to promote return to center steering. Stock strut rods on late 1st generation Mustangs ('68 '73) 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 bushigns