Arlie, I ordered 620's for our car but I found that they rode harsher then I liked.
I then ordered the stock rated springs from Eaton Spring Inc. and for me, I like them.
I knew the spring rating at the time but I can't remember now. My memorary's good but it is short. The part number for the springs is MUC1270 and you can check on the Eatonsprings.com site for information or you can contact Mike at
mike@eatonsprings.com. I found Mike to be very helpful when I spoke with him.
I hope this helps,
Dave