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@lostbuoy
Did a little bit of web searching.
Heres the catalogue for those parts: http://www.equusbicycle.com/bike/sakae/catalog18/index.html
The single cranks are here: http://www.equusbicycle.com/bike/sakae/catalog18/pdf/sakaecatalog18_%203.pdf
It states that the RY-BBS series of BB's are designed for these cranks.
While it doesn't specify either ISO or JIS I did find this VeloBase page which advertises the same BB's as ISO: http://velobase.com/ViewComponent.aspx?ID=cd004cca-7d07-4194-b61b-77d6f8698f91