I have the top caps, I am assuming salt, water, heat and cold had their way with almost 10 yr old bearings. When I installed the new ones I filled the top with synthetic bearing grease in hopes of prolonging their life.
I thought about using silicone to seal up the bearing with the top and bottom dust caps but didn't think it would have been a good idea for moisture.
I have replaced suspension on about a dozen cars at least and I have never come across strut mounts this bad. Usually its the rubber that is worn out, almost never the bearing.
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