I used a disc brake kit from PLyDo, do not know if they are still around. I used the original axle and spindles, slide a spacer on for the new bearings. The calipers are late 70's mid size GM. The kit calls for disc from the same but I wanted the 4 1/2 inch bolt pattern so I used a disc from 68-69 Fairlane. Sounds weird but it works and works well.