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The shimano one was very thin clear plastic, and only was needed on the first gen xtr cassettes. SRAM ones go between the 10-11-12 tooth cogs. 'Stealth rings' I believe they call them, no reason to be behind a cassette.
I would agree with danb's assumption seeing as the wheels didn't come with a cassette mounted.
chiroshi
I believe that issue was with xtr cassettes?
from Shimano:
"M9100 cassettes ship with a thin plastic shim that goes behind the largest cog, and it snugs everything down. If it came as OEM part on a complete bike, it's possible that shim wasn't installed, and that can cause creaking. Please remove the cassette and verify it's there."