off of sheldon's site...:

"
ISO cranks (Campagnolo, Stronglight, others) won't go as far onto J.I.S. spindles as they ideally should.
J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles.

In practice, you can very often get away with mixing these sizes, as long as you select an axle length that gives the desired chainline. "

I think Imma just buy the IRO and hope that all works well