the pc seal is made in 530 and in 500 . if he did use the 530 were it was cut for 500 or the spring if has dampers are broke and cutting up the seals have one set in the shop like this or the spring need a smaller seal like the 500 if you are running big spring or if the spring has no spring pocket in the head to help keep spring from skidding side ways and hooking the seal and beatting them up