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It is a standard equipment from 12 and 77 series to X340 series. But only first X340 tractors had it. You could ask it as a sparepart or second hand part, but im not sure is it possible to fit for 6748 axle.
Lock it self is American made No-Spin. So it is fitted for many solutions in a world. Originally it is designed for horse pulled mowers in America at 1950`s.
It is the best differential lock ever fitted to tractors, but nowdays it is not used much, because it need really strong axle where it is fitted. Fiatagri did use same system but if tractor was equipped with loader, it did break axle immediately