The ureathane bushings ride rougher. I have about 30,000 miles on mine now and you have to grease them every so often when they squeek. I think the real source has some that are self lubricating. They are blue.
I will probably get burned for this, but the strut beetle needs them as the stock bushing are way too soft. While they improve the handling and feel alot they are not the problem with a rough road. The shocks are. A softer shock like the GBY GR2 is better than a GBY gas adjust for on the road performance. Most of the gas shocks are for off road and not for cars driven on the road. Hope it helps.
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