Styrofoam seal on steering knuckle???

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probably just keeps it from vibrating...

if it wont turn up just use a rubber one (make it) or some RTV
 
I just go over to Staples and buy a sheet of thin packaging, wrapping, foam and cut out what you need to fit your needs.
That's what i do when i find those things to deteriorated to reuse when i'm rebuilding brakes.
 
I used some cheap acrylic caulk that was in stock. Not going to win any shows, anyhow.
 
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