Does anyone know what plating was used on the strut rod washers on 74 Road Runners? I've included pics of the ones I removed and it looks to me like the rear washers were silver zinc. The fronts (shaped differently than the earlier washers) have been sand blasted on the front side and no plating is visible. The backside has a lot of rubber from the bushings and what looks like black phosphate underneath that, although I don't really know. It does not look like the brown zinc dichromate used on some of the earlier washers.