different spring seats for SS springs?

hey guys,

Im doing some suspension tuning/adjusting and may have to go to SS springs depending on how everything works. I was looking in the mopar performance catalog and they have spring seats like what i have, and then a different part number for springs seats for SS springs...whats the difference between the two? If i want to go SS springs, do i need to torch off my old seats and put these new ones on, or can they work with the ones i have?

thanks
Matthew