Spacers will not hold up to the abuse of a lock ring and will interfere with the chain at 11 tooth diametre.
Just run the double 11 teeth.
The last cog on any cassette usually has a little wider attached spacer, so be aware of total length for full lock nut thread engagement.
Just run the double 11 teeth.
The last cog on any cassette usually has a little wider attached spacer, so be aware of total length for full lock nut thread engagement.