PasswordJdm Sells the whole conversion for $1325 shipped, it includes

Here is a JDM DC '98 Spec Integra Type R 5 Lug Front and Rear Disc Brake Conversion! Larger rotors and calipers for improved braking! Comes in a 5 x 114 bolt pattern. Includes all brake components, front knuckles, and rear trailer arms. This set requires the use of 36mm axles from a JDM '98 spec ITR or you can modify your existing axles to 36mm splines. (USDM B-series axles are 32mm). There are no brake lines, e-brake cable, shocks, springs or lower control arms included in this set.

That should answer your axle question too.