That's is Steve, you dont have to run the little rubber as the shocks are designed to run without the grommet, if they weren't and the rubber fell off, it would bust the shock cap.
The gold coloured 3.mm shim is used to limit bound movement, and the rubber grommet just floats up and down the shaft whilst on track to effectively clean the dirt off it, rather than letting the dirt get inside the shock seals.
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