1970's To 1983 - 3 1/2 Inch Wide Springs
In later applications, bronze bushings were employed for both conventional and (COE) configurations. These springs were last used in vehicles manufactured up until 1983. Additionally, springs with threaded (TB-71) bushings were utilized in very limited applications.
TB-71 springs typically share identical characteristics with these bronze-bushing springs, except for the type of bushing used. When necessary, TB-71 springs can be substituted for TNI springs, as they have the same eye size.