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You'll need a new wheel, set of dual disk lower legs, another caliper, a larger bore master cylinder, a new brake line, and another rotor. With labor and materials you'll probably be in the neighborhood of $2,600 for the conversion depending completely on the type of wheel you choose (there is a $1,000 allowance in the price estimate above).
I hope this helps. Please let me know if I can be of further assistance. Thanks, P.J.