Ok I see, thanks man. Well yeah for the front I will have the OEM calipers from a 79 Z-28 and I have no clue what size bore they used on those cars and then I will have the rear ones from Currie which will be Explorer disks so I will have disks all the way around. I will call them and see what they think. It's more confusing than what I thought. I wish I could just find some kit that came with everything like booster, master cylinder, all the valves I need, etc.