Purchase a brake kit that includes spindles with kingpins that match the diameter of the kingpin bosses of your axle, and check that the camber with those new spindles will be okay for your setup. I used a Wilwood kit on my T.
However, in my opinion disk brakes used on the narrow tired wire wheels will not net you much as they may easily lock up the fronts due to lack of tread contact, especially in a panic stop - result is no steering while locked up. You might want to change out the front wheels and tires to something that will put more tread on the front. You may also want to consider plumbing in a proportioning valve into your system to help adjust the front/rear bias.