They are KFFS-45 front strut springs which seem to suit the MY and the L series

With standard 30 year old struts I did not like the way the car handled on the road so I took them off with the intention of putting them back on when I was going to fit a new set of struts as well.
Now I am going to leave the car as standard maybe in the future all I may change are the struts and leave the standard springs in the car.
Can I get some honest opinions on how much a set of these springs may be worth and do I read the King Spring listing correctly which seems to show the springs for the MY and the L series are the same.
The springs are in good condition with only a few scuff marks and loss of paint on the end of the springs where they were fitted to the strut.