Wheel query - 11sp hub / 10sp spacer?
Just got some carbon wheels (Saturae C50 from Wiggle). No instructions or promised QC card in the box
, but rim tape and skewers all present and correct, as was a small sealed bag containing an alloy washer/spacer, but also a thin rubber 'O' ring of the same diameter. Do you reckon I'm supposed to fit BOTH on the 11sp freehub body, when using a 10sp SRAM PG1070 cassette? I haven't come across a rubber 'O' ring as a freehub spacer before so thought I'd ask if anyone on here may know....
Emailed both Wiggle and Saturae yesterday but no response from either as yet.

Emailed both Wiggle and Saturae yesterday but no response from either as yet.
Scott Solace 10 disc - Kinesis Crosslight Pro6 disc - Scott CR1 SL - Pinnacle Arkose X 650b - Pinnacle Arkose 1x11 "monster cross" - Specialized Singlecross...& an Ernie Ball Musicman Stingray 4 string...
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Another option it could be a freehub gasket seal, which you can fit behind the freehub to prevent water ingress or remove to reduce drag
EDIT: Transmission was very quiet during the 2nd shakedown ride this morning using just the one spacer. Sorted!