LittleBeast here's a pic of our Seal Head unit, Ask Bruce if his price includes it being replaced. You can still get them (or very close to it) from KYB (16mm I.D X 46MM O.D.)
This pic shows the entire shock apart, if you notice the top round plate has been destroyed, it's purpose mainly to keep people from messing with the Schrader valve. Under alot of Nitrogen Pressure. I don't think it needs to replaced if rebuilt...In my opinion
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