Thank you all for the assistance and advice so far.
I cannot see any numbers on the bottom spring now but it may be easier to see with it removed. I will update the thread with what I find. Each pack has 5 pairs of nearly identical length springs so removing the doubles would give me 10 springs per pack. The only springs I see with a hole in them for a clip are currently the 6th from the top, which is where the existing "clips" are.
Thanks again all, this has been very helpful.
