Wrong size bushings???

They made 2 different spring hangers and their respected bolts. The 6 cylinders usually came with the smaller diameter ones, and the performance cars had the larger diameter ones. Just get a matching set of springs, bolts, bushings, and hanger brackets. Personally, I'd go with the bigger ones. Looks like you already have to larger bolts, and probably the hanger brackets they fit. If you're buying new springs and bushings, order the bigger ones.