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I saw hardly any difference between the glide pro and spacers under the stock rubber mounts as far as handling goes.. I was concerned about how long the GP would last so I sold it.. I think the stockers were slightly better for the vibes but then I own an high performance evo softail and it vibrates a bit so I'm probably less sensitive.. For grins sometime, put a dial indicator on the swing arm pivot shaft and shove a pry bar between the frame and swingarm then pry a little.. Look at how easy it is to move the pivot shaft 30 to 40 thou..