Those gears look like they are not compatable with any of there current gear carriers and or the two speed set-ups.
Cat 5 in the USA make 46 & 48 tooth spurs that do work on the MT and they also work on the two speed gear boxes. I for one will not purchase the genuine FG gears because they probably cost the earth and you are paying for another gear carrier when the one you already have is perfectly good.
Have a closer look at the photo and by the way it mounts up it looks like they don't use the rubber mounts to eliminate transmission shock???