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@DFP
These are for mounting to a BMX style Bottom Bracket.
You can get Euro Sized BMX BB's but they are really expensive as the cartrdges in them have to be so tiny.
You will need to use a BMX style chainwheel with a single bolt hole to mount to the crank. Or purchase a separate 'spider' to use 4-5 bolt chainrings.
It is not really the kind of crank setup where you get to choose a spindle length/chainline. On a mtb just use spacers on the freehub body to get chain alignment correct.