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It really depends on what type of Cook Bros cranks they are and their age. BMX dogbones are the one's you are wanting, but they will cost a fair bit of £. You can also get mountain bike cranks, road cranks then you have CQP (Cooks Quality Products) etc etc.You can tell the difference between the mountain bike and BMX cranks as the mountain bike ones have a groove cut in the rear of the crank whereas the BMX ones do not.Have a look here.....http://mombat.org/MOMBAT/BikeHistoryPages/Cook_Bros.html