Somewhere between 3.5-3.6mm should work as that's what I measure the spacing between the large arms on every crank I own. I measured the thickness of the arm "shelves" up which the rings sit. So if the inner ring mounting holes are flush with the middle ring, it's obvious a 3.5-3.6mm spacer will do. I give a range because there are always slight variations of these things. If the rings are not flush with where you place the spacers, well then you must add/subtract the distance that the middle ring sticks to that. A digital caliber can measure that distance, if there is any, using the "other end" of the caliper, whatever that thingy is called.
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