These are for a friend of mine if interested please let me know and I'll give you his info. They are off of a 78 Seville and they include the factory mounting brackets to mount the large calipers to the axle - very hard to find. Now with the passenger car stuff this enables you to use these brackets/calipers/and the Seville - 11 inch rotors on GM c-clip rearend. I thought the housing ends on the 12 bolt and 10 bolt truck/car were the same. He also has the Master Cylinder that goes with this. He says all for 100$ Not a bad deal if you ask me.