Looking to replace the rubber bump stops with some late model epmd foam type. I have looked at several different oem ones, and it seems like some that fit struts might fit the stock bump stop holders?
Those are pretty soft, I doubt they would stay on the car more than one or 2 hits. They really aren't designed for that application. When I've put them on struts it usually takes 5-6 inches of compression before they come into play, sort of a last resort to help cushion a bottoming out suspension. They aren't made to take a constant pounding.
I think saltracer is pretty close on this. To me they look like the are progressional; as you push down on them they fold inside the stack then (hopefully) their compression causes them to get stronger but I don't think they are designed to be used that much... more of a back up. Shortening them (cutting the top down) reduces their effect I think. I am sure they have their place so my advice would be to just be careful when using them.
For what it is worth. My opinion is worth less than you paid for it.