GM used two different mounting bolt patterns on the strut mount retainers. 1982-1986 cars have one type, 1987-1992 cars have another type. All replacement strut mounts are machined to the 1987-1992 style mounting pattern. If you will be installing replacement strut mounts on a 1982-1986 car, you will need to get these 1987-1992 style retainers. Our strut mount retainers are CNC laser cut from 3/16" steel and have new (longer than stock) mounting bolts, flat washers and stainless steel nuts.