Here's what Omnium has to say:
Replacement steerer tube with ED coating.
Approx 325g lighter than the old version.
Available in two different lengths.
Size Guide
Standard | 63cm steerer = Fits all sizes Mini-Max and Cargo, except Cargo XL
XL | 73cm steerer = XL Cargos
Chop to length with a tube cutter or hacksaw.
Starnut included!