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bobble
It's pretty easy to find out exactly what caliper you need by measuring the brake drop - which is the distance from the caliper mounting hole to the centre of the rim. Rather than measuring directly it's easier to bend a paperclip into a V, bend the points to the correct distance, then measure the paperclip. Then this will give you a number in millimitres with which you can search.
You also need to find out whether you need a non-recessed or recessed brake fitting. If the mounting holes either side of the fork crown are the same size, you need non-recessed*. If the rear one is bigger you need recessed.