They originally come with BH59, so that I guess but whatever you've got or can get will be fine.
So BH90 stuff is fine in BH59 rated levers? Tried the other way round, was useless.
Just go 90 and you'll be fine, it's silly why 59 is still a thing.
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They originally come with BH59, so that I guess but whatever you've got or can get will be fine.