I don't know.....I think I remember hearing issues with poly when I went to do mine and ended up just going back in with OEM rubbers. Figured if the first set lasted 14 yrs, a second set would last at least as long.
Fallen Angel...Former MOD......Yeah no 10 yr pin in my mailbox.............
poly is good, don't get cheap ones though, and use the synthetic grease that comes with them, and use the proper torque and they don't squeak.
the benefit is they don't wear out.
you do not want poly motor mounts though.
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I just replaced my motor mounts with the OEM ones. The design for the YJ mounts sucks. One of the metal pieces broke on the torque side of the motor and took me two days and a really good Jeep parts salvage place to find one. Scotty's Jeep Parts in Fontana, CA. Saved my a$$ many times.
I will keep my money, my guns, and my FREEDOM!
You can keep the "change".