this may help, seems like normal sprockets work, with spacers
https://www.evernote.com/shard/s3/sh/4bae9f26-2252-4be9-8229-314d0a13c754/3118242aa4dcc174f4c493cf5828165e/res/133a58c6-bd38-46f2-8a6a-ec61dcdaafe7/2%20to%203%20Speed.pdf
@laner started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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this may help, seems like normal sprockets work, with spacers
https://www.evernote.com/shard/s3/sh/4bae9f26-2252-4be9-8229-314d0a13c754/3118242aa4dcc174f4c493cf5828165e/res/133a58c6-bd38-46f2-8a6a-ec61dcdaafe7/2%20to%203%20Speed.pdf