Here's a great comparison between the original lower control arm and the new McGaughy's unit. The McGaughy's unit is a little lighter, and features much sturdier construction, especially in the spring pocket area. Overall, the McGaughy's A-arms just give a cleaner, more high-tech look. Don't throw away your original A-arms, though. You never know when someone doing a stock restoration might need a control arm, and it's just good insurance to keep parts like this around. Our original A-arms have an appointment with a bead blaster and some fresh paint before being stored.