5mm of axle spacers each side (https://www.hubjub.co.uk/chainring-or-axle-spacers-44-p.asp) and Campag track nuts (they're much shallower than standard bolts, which makes up for the shorter axles) and you're golden: https://www.hubjub.co.uk/campagnolo-track-nuts-76-p.asp
@Death_at_Altitude started
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5mm of axle spacers each side (https://www.hubjub.co.uk/chainring-or-axle-spacers-44-p.asp) and Campag track nuts (they're much shallower than standard bolts, which makes up for the shorter axles) and you're golden: https://www.hubjub.co.uk/campagnolo-track-nuts-76-p.asp