These spacers are well built and sturdy. The stock rubber coil spring retainer fit the spacers snugly, but I was concerned that the large hole at the top was too loose when centering the factory mounting tab. I installed them anyway, have driven about 1000 miles and can't hear them rattling or moving. Perhaps the constant pressure of the coil springs is enough to keep them in place. I contacted Traxda for clarification but never received a response.
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