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@gbj_tester
They vary, the spacer between the rings is 2.6mm but the centreline of the teeth isn't necessarily on the centreline plane of the ring mounting section, as some Campag rings are dished.Your track ring is obviously going to be thicker than 10s road rings, but that doesn't matter for this purpose. You'll need something like 5-6mm of spacer sandwiched between the inner ring and the back of the crank, and you want it to be pretty close to right; Campag actually supply shims just 0.08mm thick to dial things in to avoid bending the rings.