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Good, the OE Rotor will seal the openings in the Rotor Mtg Surface, but if you ever change to a different rotor, you'll want to check for that. That's why HD created that spacer/shim.
Btw, you probably noticed the larger than typical OD of that spacer/shim. (I had someone measure it for me ... approx 5-1/8" OD)
Here's an example of the Stock OE Rotor Sealing off the openings (look closely at Rotor Pattern left on the Mtg surface)... btw, that wheel corroded from water entering the Pulley side
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