Fizik Arione - 7x9mm saddle rails

I want to try a new saddle on my roadie; it’s got a campagnolo record alloy post on it (one of the old shield logo ones).

Has anyone tried the carbon railed 7x9mm Fizik saddles with these older seatposts?

From what I can tell the rails are 2mm taller than the standard set up; I would think the clamp could accommodate an extra 2mm in height? It comes down to the length of the seatpost head bolt, right?

any help appreciated.