In part, it depends on the size and shape of the existing equalizer. You want something that the attach points for the shackles and the pivot fall out about where the original solid equalizer does now. I have looked at every single "rubber" or "cushioned" equalizer on the market, MoRyde, Lippert, Dexter, and none of them come close to my rather odd equalizer and shackles. Anything I could install would tend to lower the trailer, and its already too low.
I have actually read complaints about the MoRyde units, that the rubber in them didn't last long, But you need to read the reviews, on Etrailer.com and anywhere else you can find reviews on them.
This set here comes real close for me...... https://www.etrailer.com/Trailer-Lea.../LC696740.html
And while not a fan of Lippert products, I actually do like the design of these, but no telling how good they really are.