And I'm not so sure they last longer either. I put urethane body mounts on my blue K20 and three of them have went bad in 10 years. The truck also doesn't flex. I noticed I have another one that is coming apart right now under the cab.
I agree with Wes, I put the stock rubber mounts on my latest green one. The original ones were 33 years old and still looked good.
Just my two cents.
