Interesting,
I was going by the dimensions here:
EK CoolStream SE 240 Slim Dual Radiator available to buy online from PC Case Gear – Australia’s Premier Online PC Store.
www.pccasegear.com
however, I see your point now, as the EK website says 28mm . . . . must have been an update? or perhaps my local vendor stocks the older version still?
EK-CoolStream SE is a slim, high-performance computer liquid cooling radiator which combines EK's unique CSQ design with latest radiator core engine.Best cooling capacity in the ~25mm thick radiator class!
www.ekwb.com