1975 energy absorbing bumpers?

Hello all,
Has anyone refurbed any of these front energy absorbers? My Scamp's rubber "dust boots" are shot. I haven't found anything on any of the online Mopar sites. I'm trying to find some sort of soft flexible rubber (Approx. 3" diameter) to use after I get these finished up. This is not a show car, but I'd like to keep it as close to original as possible. Any help would be appreciated.
Front Energy Shock. (3).jpg
Front Energy Shock. (4).jpg