It uses four small square clips that attach themselves to the radiator side brackets, two per bracket. Then you need four finely threaded bolts with very small hex heads(SEMS stamped on early 1970 model year bolt heads and a stylised "P" stamped on all later ones) and large washers to attach the shroud to the rad brackets You can get the NOS bolts(silver zinc plated) and clips from Roger Gibson. They are for all 26" E and B Body rads.