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I ordered the one from SJS which lists the Alfine as "type A" compatible so should do the job
The one linked by @Dry lists FC-S501 as a match, but this one which looks like the smaller thread is listed as a match for FC-S500, so the exact choice depends on which version of the Alfine crank you have, the earlier S500 based on the 4500 cranks or the current S501 based on the 4600 cranks.
gbj_tester
I ordered the one from SJS which lists the Alfine as "type A" compatible so should do the job.