They are still flexible and do have to expand over the shackle pins. My originals were still intact and seem to be similar in make-up. I really didn't pay them much attention when replacing them. The big hurdle I fought was running short 2 shackle pins. Both NAPA and Rock Auto want to sell the pins that are too long (for the later 2 inch wide springs) telling you they will fit...wrong! Finally found the correct ones from a spring maker.
