Super stock springs

Really? I put a pair on the back of my Coronet before Christmas. They fit right on. I wonder of the shock bolts are different?

they must be! I have a 68 318 barracuda and a 69 383 barracuda both have the bigger shock bolt on top. Same size as the bottom bolt. I guess I can change the top bolt? Car is up on my lift so I only looked at it from underneath.