Same thing I told you in your other thread. No one makes kits for these. Also, there is no fuzz on the platform - this is a B-body car. The J88 uses the smaller brakes and rear axle from the A-body cars to cut costs. As a result, the front spindles and rear axle housing are unique to the 1964 J88. Do not expect mainstream vendors to even know what a J88 is, much less know the subtleties of how it differs from other B-body cars. You and about three other people are the only ones on the planet looking for these parts. No one makes them.

As I told you before, you will have to fabricate your own if you want to do this. The A-body front rotors will bolt right onto your front spindles. You will need to cut and weld tabs onto the A-body caliper brackets to attach them to your unique J88 spindles. Ironically, since the J88 rear axle housing is actually just a wider version of the Cutlass housing, any rear disk brake kit that bolts to a 64 Cutlass will also bolt to your car.