I'd echo everything P!N20 writes, but after you take your own measurements and THEN if you are still looking for a 40mm SH unit, you might be in slightly better luck if Sutherland's published SH specs are correct: the Falcon FL250S is just over that with 40.1 so might be just fine.
That said I really like and have had excellent luck with the (much easier to find) Tange Levin which for the stock model has an even shorter SH -37.8- that you can easily compensate for with some washers or a thin spacer and I rarely have any trouble servicing them so the sealed bearings (in the Falcons) are not a big selling point, for me.
Here' a screengrab of just the Tange HS specs from Sutherland, the last column is the combined (full) stack heights, as they measured the actual samples (rather than the mfgs, claimed specs), or so they tell us...



My old copy of Sutherlands does not have any of the VO units, nor do they show the Tange Passage model, which has an even lower SH than the std. Levin, and cheaper too, but it has lower quality races than any of the Levins (AFAIK) so keeping that one well-lubed is more critical