69 Dart Disc Brake Conversion

5x4 rear discs might be a challenge. Wilwood would be the only one i would think might have these otherwise custom. If your going to swap to 4 wheel disk why not just go 5x4.5? Wheel options open up greatly. FYI, 73-up stock front discs widen the track, so keep in mind what you want to run for wheels as the may not come in the offset you need.