I have a 69 340Swinger 4 speed with some wheel hop issues. 11 Years ago when I was restoring the car, I purchased the Mancini Xtra Heavy Duty leaf springs. I'm questioning now if I have the springs on the correct sides. Not sure if they have different rates like SS springs but today they advertise them with different part numbers. Anyone have experience with identifying them. There are no numbers stamped on them. I could not reach them today so tomorrow I will try again. The one with blue tape I had installed on the left side of the car. Their pic shows two clamps on the front segment of one and one clamp on the other. Mine have only one clamp. Thanks for your help.